1caf43b02SWarner Losh /*- 251369649SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 351369649SPedro F. Giffuni * 482cd038dSYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 582cd038dSYoshinobu Inoue * All rights reserved. 682cd038dSYoshinobu Inoue * 782cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 882cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 982cd038dSYoshinobu Inoue * are met: 1082cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 1182cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 1282cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 1382cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 1482cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 1582cd038dSYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 1682cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 1782cd038dSYoshinobu Inoue * without specific prior written permission. 1882cd038dSYoshinobu Inoue * 1982cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2082cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2182cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2282cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2382cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2482cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2582cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2682cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2782cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2882cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2982cd038dSYoshinobu Inoue * SUCH DAMAGE. 30b48287a3SDavid E. O'Brien * 31b48287a3SDavid E. O'Brien * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ 3282cd038dSYoshinobu Inoue */ 3382cd038dSYoshinobu Inoue 34caf43b02SWarner Losh /*- 3582cd038dSYoshinobu Inoue * Copyright (c) 1982, 1986, 1988, 1993 3682cd038dSYoshinobu Inoue * The Regents of the University of California. All rights reserved. 3782cd038dSYoshinobu Inoue * 3882cd038dSYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 3982cd038dSYoshinobu Inoue * modification, are permitted provided that the following conditions 4082cd038dSYoshinobu Inoue * are met: 4182cd038dSYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 4282cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 4382cd038dSYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 4482cd038dSYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 4582cd038dSYoshinobu Inoue * documentation and/or other materials provided with the distribution. 46fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 4782cd038dSYoshinobu Inoue * may be used to endorse or promote products derived from this software 4882cd038dSYoshinobu Inoue * without specific prior written permission. 4982cd038dSYoshinobu Inoue * 5082cd038dSYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 5182cd038dSYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 5282cd038dSYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 5382cd038dSYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 5482cd038dSYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 5582cd038dSYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 5682cd038dSYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 5782cd038dSYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 5882cd038dSYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5982cd038dSYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6082cd038dSYoshinobu Inoue * SUCH DAMAGE. 6182cd038dSYoshinobu Inoue */ 6282cd038dSYoshinobu Inoue 63b48287a3SDavid E. O'Brien #include <sys/cdefs.h> 64f0cace5dSRobert Watson #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */ 65f0cace5dSRobert Watson 66686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h" 67686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h" 6882cd038dSYoshinobu Inoue 6982cd038dSYoshinobu Inoue #include <sys/param.h> 70960ed29cSSeigo Tanimura #include <sys/domain.h> 7176ca6f88SJamie Gritton #include <sys/jail.h> 72960ed29cSSeigo Tanimura #include <sys/kernel.h> 73960ed29cSSeigo Tanimura #include <sys/lock.h> 7433841545SHajimu UMEMOTO #include <sys/malloc.h> 7582cd038dSYoshinobu Inoue #include <sys/mbuf.h> 76530c0060SRobert Watson #include <sys/proc.h> 7782cd038dSYoshinobu Inoue #include <sys/protosw.h> 78960ed29cSSeigo Tanimura #include <sys/signalvar.h> 7982cd038dSYoshinobu Inoue #include <sys/socket.h> 8082cd038dSYoshinobu Inoue #include <sys/socketvar.h> 81960ed29cSSeigo Tanimura #include <sys/sx.h> 8282cd038dSYoshinobu Inoue #include <sys/syslog.h> 83960ed29cSSeigo Tanimura #include <sys/systm.h> 84960ed29cSSeigo Tanimura #include <sys/time.h> 8582cd038dSYoshinobu Inoue 8682cd038dSYoshinobu Inoue #include <net/if.h> 8776039bc8SGleb Smirnoff #include <net/if_var.h> 8882cd038dSYoshinobu Inoue #include <net/if_dl.h> 896e6b3f7cSQing Li #include <net/if_llatbl.h> 903d0d5b21SJustin Hibbits #include <net/if_private.h> 9182cd038dSYoshinobu Inoue #include <net/if_types.h> 92960ed29cSSeigo Tanimura #include <net/route.h> 93da187ddbSAlexander V. Chernikov #include <net/route/route_ctl.h> 949ac7c6cfSAlexander V. Chernikov #include <net/route/nhop.h> 954b79449eSBjoern A. Zeeb #include <net/vnet.h> 9682cd038dSYoshinobu Inoue 9782cd038dSYoshinobu Inoue #include <netinet/in.h> 98960ed29cSSeigo Tanimura #include <netinet/in_pcb.h> 9982cd038dSYoshinobu Inoue #include <netinet/in_var.h> 100686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h> 101686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h> 10297d8d152SAndre Oppermann #include <netinet/tcp_var.h> 1034b79449eSBjoern A. Zeeb 1049977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h> 10582cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h> 106960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h> 107960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h> 108a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h> 109960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h> 110960ed29cSSeigo Tanimura #include <netinet6/nd6.h> 1111db8d1f8SAna Kukec #include <netinet6/send.h> 11282cd038dSYoshinobu Inoue 11343d39ca7SGleb Smirnoff extern ip6proto_ctlinput_t *ip6_ctlprotox[]; 11497021c24SMarko Zec 115a786f679SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat); 116a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(icmp6stat); 1174f96be33SGleb Smirnoff SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, 1184f96be33SGleb Smirnoff struct icmp6stat, icmp6stat, 1194f96be33SGleb Smirnoff "ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)"); 120a786f679SAndrey V. Elsukov 121a786f679SAndrey V. Elsukov #ifdef VIMAGE 122a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(icmp6stat); 123a786f679SAndrey V. Elsukov #endif /* VIMAGE */ 12482cea7e6SBjoern A. Zeeb 1254f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_rediraccept) = 1; 1264f96be33SGleb Smirnoff #define V_icmp6_rediraccept VNET(icmp6_rediraccept) 1274f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept, 1284f96be33SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0, 1294f96be33SGleb Smirnoff "Accept ICMPv6 redirect messages"); 1304f96be33SGleb Smirnoff 1314f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_redirtimeout) = 10 * 60; /* 10 minutes */ 1324f96be33SGleb Smirnoff #define V_icmp6_redirtimeout VNET(icmp6_redirtimeout) 1334f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout, 1344f96be33SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0, 1354f96be33SGleb Smirnoff "Delay in seconds before expiring redirect route"); 1364f96be33SGleb Smirnoff 1374f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_nodeinfo) = 0; 1384f96be33SGleb Smirnoff #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo) 1394f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo, 1404f96be33SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0, 1414f96be33SGleb Smirnoff "Mask of enabled RFC4620 node information query types"); 1424f96be33SGleb Smirnoff 143eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo); 1444f96be33SGleb Smirnoff #define V_ripcbinfo VNET(ripcbinfo) 1454f96be33SGleb Smirnoff 14649dc650cSAndrey V. Elsukov static void icmp6_errcount(int, int); 1479233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int); 1480700d2c3SBjoern A. Zeeb static void icmp6_reflect(struct mbuf *, size_t); 1496f56329aSXin LI static const char *icmp6_redirect_diag(struct in6_addr *, 1506f56329aSXin LI struct in6_addr *, struct in6_addr *); 1517460ef5dSHiroki Sato static struct mbuf *ni6_input(struct mbuf *, int, struct prison *); 1529233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int); 1539233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int); 1546f56329aSXin LI static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 1556f56329aSXin LI struct ifnet **, struct in6_addr *); 1566f56329aSXin LI static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 1576f56329aSXin LI struct ifnet *, int); 158fcb3f813SGleb Smirnoff static int icmp6_notify_error(struct mbuf **, int, int); 15982cd038dSYoshinobu Inoue 160315e3e38SRobert Watson /* 161315e3e38SRobert Watson * Kernel module interface for updating icmp6stat. The argument is an index 162315e3e38SRobert Watson * into icmp6stat treated as an array of u_quad_t. While this encodes the 163315e3e38SRobert Watson * general layout of icmp6stat into the caller, it doesn't encode its 164315e3e38SRobert Watson * location, so that future changes to add, for example, per-CPU stats 165315e3e38SRobert Watson * support won't cause binary compatibility problems for kernel modules. 166315e3e38SRobert Watson */ 167315e3e38SRobert Watson void 168315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum) 169315e3e38SRobert Watson { 170315e3e38SRobert Watson 171a786f679SAndrey V. Elsukov counter_u64_add(VNET(icmp6stat)[statnum], 1); 172315e3e38SRobert Watson } 173315e3e38SRobert Watson 174686cdd19SJun-ichiro itojun Hagino static void 17549dc650cSAndrey V. Elsukov icmp6_errcount(int type, int code) 176686cdd19SJun-ichiro itojun Hagino { 177686cdd19SJun-ichiro itojun Hagino switch (type) { 178686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH: 179686cdd19SJun-ichiro itojun Hagino switch (code) { 180686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOROUTE: 18149dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noroute); 182686cdd19SJun-ichiro itojun Hagino return; 183686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADMIN: 18449dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_admin); 185686cdd19SJun-ichiro itojun Hagino return; 186686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 18749dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_beyondscope); 188686cdd19SJun-ichiro itojun Hagino return; 189686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_ADDR: 19049dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_addr); 191686cdd19SJun-ichiro itojun Hagino return; 192686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_NOPORT: 19349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_odst_unreach_noport); 194686cdd19SJun-ichiro itojun Hagino return; 195686cdd19SJun-ichiro itojun Hagino } 196686cdd19SJun-ichiro itojun Hagino break; 197686cdd19SJun-ichiro itojun Hagino case ICMP6_PACKET_TOO_BIG: 19849dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_opacket_too_big); 199686cdd19SJun-ichiro itojun Hagino return; 200686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEEDED: 201686cdd19SJun-ichiro itojun Hagino switch (code) { 202686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_TRANSIT: 20349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_transit); 204686cdd19SJun-ichiro itojun Hagino return; 205686cdd19SJun-ichiro itojun Hagino case ICMP6_TIME_EXCEED_REASSEMBLY: 20649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_otime_exceed_reassembly); 207686cdd19SJun-ichiro itojun Hagino return; 208686cdd19SJun-ichiro itojun Hagino } 209686cdd19SJun-ichiro itojun Hagino break; 210686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAM_PROB: 211686cdd19SJun-ichiro itojun Hagino switch (code) { 212686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_HEADER: 21349dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_header); 214686cdd19SJun-ichiro itojun Hagino return; 215686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_NEXTHEADER: 21649dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_nextheader); 217686cdd19SJun-ichiro itojun Hagino return; 218686cdd19SJun-ichiro itojun Hagino case ICMP6_PARAMPROB_OPTION: 21949dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oparamprob_option); 220686cdd19SJun-ichiro itojun Hagino return; 221686cdd19SJun-ichiro itojun Hagino } 222686cdd19SJun-ichiro itojun Hagino break; 223686cdd19SJun-ichiro itojun Hagino case ND_REDIRECT: 22449dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_oredirect); 225686cdd19SJun-ichiro itojun Hagino return; 226686cdd19SJun-ichiro itojun Hagino } 22749dc650cSAndrey V. Elsukov ICMP6STAT_INC(icp6s_ounknown); 228686cdd19SJun-ichiro itojun Hagino } 229686cdd19SJun-ichiro itojun Hagino 23082cd038dSYoshinobu Inoue /* 231a1f7e5f8SHajimu UMEMOTO * A wrapper function for icmp6_error() necessary when the erroneous packet 232a1f7e5f8SHajimu UMEMOTO * may not contain enough scope zone information. 233a1f7e5f8SHajimu UMEMOTO */ 234a1f7e5f8SHajimu UMEMOTO void 2351272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param, 2361272577eSXin LI struct ifnet *ifp) 237a1f7e5f8SHajimu UMEMOTO { 238a1f7e5f8SHajimu UMEMOTO struct ip6_hdr *ip6; 239a1f7e5f8SHajimu UMEMOTO 240a1f7e5f8SHajimu UMEMOTO if (ifp == NULL) 241a1f7e5f8SHajimu UMEMOTO return; 242a1f7e5f8SHajimu UMEMOTO 243a1f7e5f8SHajimu UMEMOTO if (m->m_len < sizeof(struct ip6_hdr)) { 244a1f7e5f8SHajimu UMEMOTO m = m_pullup(m, sizeof(struct ip6_hdr)); 245a61b5cfbSBjoern A. Zeeb if (m == NULL) { 246a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 247a1f7e5f8SHajimu UMEMOTO return; 248a1f7e5f8SHajimu UMEMOTO } 249a61b5cfbSBjoern A. Zeeb } 250a1f7e5f8SHajimu UMEMOTO ip6 = mtod(m, struct ip6_hdr *); 251a1f7e5f8SHajimu UMEMOTO 252a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 253a1f7e5f8SHajimu UMEMOTO return; 254a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 255a1f7e5f8SHajimu UMEMOTO return; 256a1f7e5f8SHajimu UMEMOTO 257a1f7e5f8SHajimu UMEMOTO icmp6_error(m, type, code, param); 258a1f7e5f8SHajimu UMEMOTO } 259a1f7e5f8SHajimu UMEMOTO 260a1f7e5f8SHajimu UMEMOTO /* 26182cd038dSYoshinobu Inoue * Generate an error packet of type error in response to bad IP6 packet. 26282cd038dSYoshinobu Inoue */ 26382cd038dSYoshinobu Inoue void 2641272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param) 26582cd038dSYoshinobu Inoue { 26682cd038dSYoshinobu Inoue struct ip6_hdr *oip6, *nip6; 26782cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 268605284b8SAlexander V. Chernikov struct epoch_tracker et; 269686cdd19SJun-ichiro itojun Hagino u_int preplen; 27082cd038dSYoshinobu Inoue int off; 271686cdd19SJun-ichiro itojun Hagino int nxt; 27282cd038dSYoshinobu Inoue 273e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_error); 27482cd038dSYoshinobu Inoue 275686cdd19SJun-ichiro itojun Hagino /* count per-type-code statistics */ 27649dc650cSAndrey V. Elsukov icmp6_errcount(type, code); 27782cd038dSYoshinobu Inoue 278686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 279686cdd19SJun-ichiro itojun Hagino if (m->m_flags & M_DECRYPTED) { 280e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 281686cdd19SJun-ichiro itojun Hagino goto freeit; 282686cdd19SJun-ichiro itojun Hagino } 283686cdd19SJun-ichiro itojun Hagino #endif 284686cdd19SJun-ichiro itojun Hagino 285686cdd19SJun-ichiro itojun Hagino if (m->m_len < sizeof(struct ip6_hdr)) { 286686cdd19SJun-ichiro itojun Hagino m = m_pullup(m, sizeof(struct ip6_hdr)); 287a61b5cfbSBjoern A. Zeeb if (m == NULL) { 288a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 289686cdd19SJun-ichiro itojun Hagino return; 290686cdd19SJun-ichiro itojun Hagino } 291a61b5cfbSBjoern A. Zeeb } 29282cd038dSYoshinobu Inoue oip6 = mtod(m, struct ip6_hdr *); 29382cd038dSYoshinobu Inoue 29482cd038dSYoshinobu Inoue /* 295f95d4633SHajimu UMEMOTO * If the destination address of the erroneous packet is a multicast 296f95d4633SHajimu UMEMOTO * address, or the packet was sent using link-layer multicast, 297f95d4633SHajimu UMEMOTO * we should basically suppress sending an error (RFC 2463, Section 298f95d4633SHajimu UMEMOTO * 2.4). 299f95d4633SHajimu UMEMOTO * We have two exceptions (the item e.2 in that section): 3001767c520SBjoern A. Zeeb * - the Packet Too Big message can be sent for path MTU discovery. 301f95d4633SHajimu UMEMOTO * - the Parameter Problem Message that can be allowed an icmp6 error 302f95d4633SHajimu UMEMOTO * in the option type field. This check has been done in 303f95d4633SHajimu UMEMOTO * ip6_unknown_opt(), so we can just check the type and code. 30482cd038dSYoshinobu Inoue */ 30582cd038dSYoshinobu Inoue if ((m->m_flags & (M_BCAST|M_MCAST) || 30682cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 30782cd038dSYoshinobu Inoue (type != ICMP6_PACKET_TOO_BIG && 30882cd038dSYoshinobu Inoue (type != ICMP6_PARAM_PROB || 30982cd038dSYoshinobu Inoue code != ICMP6_PARAMPROB_OPTION))) 31082cd038dSYoshinobu Inoue goto freeit; 31182cd038dSYoshinobu Inoue 312f95d4633SHajimu UMEMOTO /* 313f95d4633SHajimu UMEMOTO * RFC 2463, 2.4 (e.5): source address check. 314f95d4633SHajimu UMEMOTO * XXX: the case of anycast source? 315f95d4633SHajimu UMEMOTO */ 31682cd038dSYoshinobu Inoue if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 31782cd038dSYoshinobu Inoue IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 31882cd038dSYoshinobu Inoue goto freeit; 31982cd038dSYoshinobu Inoue 32082cd038dSYoshinobu Inoue /* 321686cdd19SJun-ichiro itojun Hagino * If we are about to send ICMPv6 against ICMPv6 error/redirect, 322686cdd19SJun-ichiro itojun Hagino * don't do it. 32382cd038dSYoshinobu Inoue */ 324686cdd19SJun-ichiro itojun Hagino nxt = -1; 325686cdd19SJun-ichiro itojun Hagino off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 326686cdd19SJun-ichiro itojun Hagino if (off >= 0 && nxt == IPPROTO_ICMPV6) { 32782cd038dSYoshinobu Inoue struct icmp6_hdr *icp; 32882cd038dSYoshinobu Inoue 329a4adf6ccSBjoern A. Zeeb if (m->m_len < off + sizeof(struct icmp6_hdr)) { 330a61b5cfbSBjoern A. Zeeb m = m_pullup(m, off + sizeof(struct icmp6_hdr)); 331a61b5cfbSBjoern A. Zeeb if (m == NULL) { 332a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 333686cdd19SJun-ichiro itojun Hagino return; 334686cdd19SJun-ichiro itojun Hagino } 335a4adf6ccSBjoern A. Zeeb } 336a61b5cfbSBjoern A. Zeeb oip6 = mtod(m, struct ip6_hdr *); 337a61b5cfbSBjoern A. Zeeb icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 338a61b5cfbSBjoern A. Zeeb 339686cdd19SJun-ichiro itojun Hagino if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 340686cdd19SJun-ichiro itojun Hagino icp->icmp6_type == ND_REDIRECT) { 34182cd038dSYoshinobu Inoue /* 34282cd038dSYoshinobu Inoue * ICMPv6 error 34382cd038dSYoshinobu Inoue * Special case: for redirect (which is 34482cd038dSYoshinobu Inoue * informational) we must not send icmp6 error. 34582cd038dSYoshinobu Inoue */ 346e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_canterror); 34782cd038dSYoshinobu Inoue goto freeit; 34882cd038dSYoshinobu Inoue } else { 349686cdd19SJun-ichiro itojun Hagino /* ICMPv6 informational - send the error */ 35082cd038dSYoshinobu Inoue } 351686cdd19SJun-ichiro itojun Hagino } else { 352686cdd19SJun-ichiro itojun Hagino /* non-ICMPv6 - send the error */ 35382cd038dSYoshinobu Inoue } 35482cd038dSYoshinobu Inoue 35582cd038dSYoshinobu Inoue /* Finally, do rate limitation check. */ 356c6c96aabSGleb Smirnoff if (icmp6_ratelimit(&oip6->ip6_src, type, code)) 35782cd038dSYoshinobu Inoue goto freeit; 35882cd038dSYoshinobu Inoue 35982cd038dSYoshinobu Inoue /* 36082cd038dSYoshinobu Inoue * OK, ICMP6 can be generated. 36182cd038dSYoshinobu Inoue */ 36282cd038dSYoshinobu Inoue 36382cd038dSYoshinobu Inoue if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 36482cd038dSYoshinobu Inoue m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 36582cd038dSYoshinobu Inoue 366686cdd19SJun-ichiro itojun Hagino preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 367eb1b1807SGleb Smirnoff M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */ 36882cd038dSYoshinobu Inoue if (m == NULL) { 36933841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 37082cd038dSYoshinobu Inoue return; 37182cd038dSYoshinobu Inoue } 37282cd038dSYoshinobu Inoue 37382cd038dSYoshinobu Inoue nip6 = mtod(m, struct ip6_hdr *); 37482cd038dSYoshinobu Inoue nip6->ip6_src = oip6->ip6_src; 37582cd038dSYoshinobu Inoue nip6->ip6_dst = oip6->ip6_dst; 37682cd038dSYoshinobu Inoue 3779a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_src); 3789a4f9608SHajimu UMEMOTO in6_clearscope(&oip6->ip6_dst); 37982cd038dSYoshinobu Inoue 38082cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(nip6 + 1); 38182cd038dSYoshinobu Inoue icmp6->icmp6_type = type; 38282cd038dSYoshinobu Inoue icmp6->icmp6_code = code; 38382cd038dSYoshinobu Inoue icmp6->icmp6_pptr = htonl((u_int32_t)param); 38482cd038dSYoshinobu Inoue 385e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[type]); 386605284b8SAlexander V. Chernikov NET_EPOCH_ENTER(et); 38782cd038dSYoshinobu Inoue icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 388605284b8SAlexander V. Chernikov NET_EPOCH_EXIT(et); 389686cdd19SJun-ichiro itojun Hagino 390686cdd19SJun-ichiro itojun Hagino return; 391686cdd19SJun-ichiro itojun Hagino 392686cdd19SJun-ichiro itojun Hagino freeit: 393686cdd19SJun-ichiro itojun Hagino /* 394cd0fdcf7SHajimu UMEMOTO * If we can't tell whether or not we can generate ICMP6, free it. 395686cdd19SJun-ichiro itojun Hagino */ 396686cdd19SJun-ichiro itojun Hagino m_freem(m); 39782cd038dSYoshinobu Inoue } 39882cd038dSYoshinobu Inoue 399fcb3f813SGleb Smirnoff int 400fcb3f813SGleb Smirnoff icmp6_errmap(const struct icmp6_hdr *icmp6) 401fcb3f813SGleb Smirnoff { 402fcb3f813SGleb Smirnoff 403fcb3f813SGleb Smirnoff switch (icmp6->icmp6_type) { 404fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH: 405fcb3f813SGleb Smirnoff switch (icmp6->icmp6_code) { 406fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_NOROUTE: 407fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_ADDR: 408fcb3f813SGleb Smirnoff return (EHOSTUNREACH); 409fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_NOPORT: 410fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_ADMIN: 411fcb3f813SGleb Smirnoff return (ECONNREFUSED); 412fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_BEYONDSCOPE: 413fcb3f813SGleb Smirnoff return (ENOPROTOOPT); 414fcb3f813SGleb Smirnoff default: 415fcb3f813SGleb Smirnoff return (0); /* Shouldn't happen. */ 416fcb3f813SGleb Smirnoff } 417fcb3f813SGleb Smirnoff case ICMP6_PACKET_TOO_BIG: 418fcb3f813SGleb Smirnoff return (EMSGSIZE); 419fcb3f813SGleb Smirnoff case ICMP6_TIME_EXCEEDED: 420fcb3f813SGleb Smirnoff switch (icmp6->icmp6_code) { 421fcb3f813SGleb Smirnoff case ICMP6_TIME_EXCEED_TRANSIT: 422fcb3f813SGleb Smirnoff return (EHOSTUNREACH); 423fcb3f813SGleb Smirnoff case ICMP6_TIME_EXCEED_REASSEMBLY: 424fcb3f813SGleb Smirnoff return (0); 425fcb3f813SGleb Smirnoff default: 426fcb3f813SGleb Smirnoff return (0); /* Shouldn't happen. */ 427fcb3f813SGleb Smirnoff } 428fcb3f813SGleb Smirnoff case ICMP6_PARAM_PROB: 429fcb3f813SGleb Smirnoff switch (icmp6->icmp6_code) { 430fcb3f813SGleb Smirnoff case ICMP6_PARAMPROB_NEXTHEADER: 431fcb3f813SGleb Smirnoff return (ECONNREFUSED); 432fcb3f813SGleb Smirnoff case ICMP6_PARAMPROB_HEADER: 433fcb3f813SGleb Smirnoff case ICMP6_PARAMPROB_OPTION: 434fcb3f813SGleb Smirnoff return (ENOPROTOOPT); 435fcb3f813SGleb Smirnoff default: 436fcb3f813SGleb Smirnoff return (0); /* Shouldn't happen. */ 437fcb3f813SGleb Smirnoff } 438fcb3f813SGleb Smirnoff default: 439fcb3f813SGleb Smirnoff return (0); 440fcb3f813SGleb Smirnoff } 441fcb3f813SGleb Smirnoff } 442fcb3f813SGleb Smirnoff 44382cd038dSYoshinobu Inoue /* 44482cd038dSYoshinobu Inoue * Process a received ICMP6 message. 44582cd038dSYoshinobu Inoue */ 44682cd038dSYoshinobu Inoue int 4471272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto) 44882cd038dSYoshinobu Inoue { 449503f4e47SBjoern A. Zeeb struct mbuf *m, *n; 45029dc7bc6SBruce M Simpson struct ifnet *ifp; 45182cd038dSYoshinobu Inoue struct ip6_hdr *ip6, *nip6; 45282cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6, *nicmp6; 4531d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 454503f4e47SBjoern A. Zeeb int code, error, icmp6len, ip6len, noff, off, sum; 45582cd038dSYoshinobu Inoue 456a37a5246SAlexander V. Chernikov NET_EPOCH_ASSERT(); 457a37a5246SAlexander V. Chernikov 458503f4e47SBjoern A. Zeeb m = *mp; 459503f4e47SBjoern A. Zeeb off = *offp; 46029dc7bc6SBruce M Simpson 461a4adf6ccSBjoern A. Zeeb if (m->m_len < off + sizeof(struct icmp6_hdr)) { 462a61b5cfbSBjoern A. Zeeb m = m_pullup(m, off + sizeof(struct icmp6_hdr)); 463a61b5cfbSBjoern A. Zeeb if (m == NULL) { 464a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 465a61b5cfbSBjoern A. Zeeb *mp = m; 466a61b5cfbSBjoern A. Zeeb return (IPPROTO_DONE); 467a61b5cfbSBjoern A. Zeeb } 468a4adf6ccSBjoern A. Zeeb } 46982cd038dSYoshinobu Inoue 47082cd038dSYoshinobu Inoue /* 47182cd038dSYoshinobu Inoue * Locate icmp6 structure in mbuf, and check 47282cd038dSYoshinobu Inoue * that not corrupted and of at least minimum length 47382cd038dSYoshinobu Inoue */ 47482cd038dSYoshinobu Inoue 475503f4e47SBjoern A. Zeeb icmp6len = m->m_pkthdr.len - off; 47682cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr)) { 477e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 47882cd038dSYoshinobu Inoue goto freeit; 47982cd038dSYoshinobu Inoue } 48082cd038dSYoshinobu Inoue 481503f4e47SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 482503f4e47SBjoern A. Zeeb ifp = m->m_pkthdr.rcvif; 48382cd038dSYoshinobu Inoue /* 48433cde130SBruce M Simpson * Check multicast group membership. 48533cde130SBruce M Simpson * Note: SSM filters are not applied for ICMPv6 traffic. 48633cde130SBruce M Simpson */ 48733cde130SBruce M Simpson if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 48833cde130SBruce M Simpson struct in6_multi *inm; 48933cde130SBruce M Simpson 49033cde130SBruce M Simpson inm = in6m_lookup(ifp, &ip6->ip6_dst); 49133cde130SBruce M Simpson if (inm == NULL) { 49233cde130SBruce M Simpson IP6STAT_INC(ip6s_notmember); 49333cde130SBruce M Simpson in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 49433cde130SBruce M Simpson goto freeit; 49533cde130SBruce M Simpson } 49633cde130SBruce M Simpson } 49733cde130SBruce M Simpson 498503f4e47SBjoern A. Zeeb /* Calculate the checksum. */ 49982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 50082cd038dSYoshinobu Inoue code = icmp6->icmp6_code; 50182cd038dSYoshinobu Inoue if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 50233841545SHajimu UMEMOTO nd6log((LOG_ERR, 50382cd038dSYoshinobu Inoue "ICMP6 checksum error(%d|%x) %s\n", 5041d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, sum, 5051d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, &ip6->ip6_src))); 506e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_checksum); 50782cd038dSYoshinobu Inoue goto freeit; 50882cd038dSYoshinobu Inoue } 50982cd038dSYoshinobu Inoue 510e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]); 51129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_msg); 51282cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 51329dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_error); 51482cd038dSYoshinobu Inoue 515503f4e47SBjoern A. Zeeb ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 51682cd038dSYoshinobu Inoue switch (icmp6->icmp6_type) { 51782cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH: 51829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_dstunreach); 51982cd038dSYoshinobu Inoue switch (code) { 52082cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_ADMIN: 52129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_adminprohib); 522fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_NOROUTE: 523fcb3f813SGleb Smirnoff case ICMP6_DST_UNREACH_ADDR: 524686cdd19SJun-ichiro itojun Hagino case ICMP6_DST_UNREACH_BEYONDSCOPE: 52582cd038dSYoshinobu Inoue case ICMP6_DST_UNREACH_NOPORT: 526fcb3f813SGleb Smirnoff goto deliver; 52782cd038dSYoshinobu Inoue default: 52882cd038dSYoshinobu Inoue goto badcode; 52982cd038dSYoshinobu Inoue } 53082cd038dSYoshinobu Inoue case ICMP6_PACKET_TOO_BIG: 53129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig); 532686cdd19SJun-ichiro itojun Hagino /* 533fcb3f813SGleb Smirnoff * Validation is made in icmp6_mtudisc_update. 534686cdd19SJun-ichiro itojun Hagino * Updating the path MTU will be done after examining 535686cdd19SJun-ichiro itojun Hagino * intermediate extension headers. 536686cdd19SJun-ichiro itojun Hagino */ 53782cd038dSYoshinobu Inoue goto deliver; 53882cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEEDED: 53929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_timeexceed); 54082cd038dSYoshinobu Inoue switch (code) { 54182cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_TRANSIT: 54282cd038dSYoshinobu Inoue case ICMP6_TIME_EXCEED_REASSEMBLY: 543fcb3f813SGleb Smirnoff goto deliver; 54482cd038dSYoshinobu Inoue default: 54582cd038dSYoshinobu Inoue goto badcode; 54682cd038dSYoshinobu Inoue } 54782cd038dSYoshinobu Inoue case ICMP6_PARAM_PROB: 54829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_paramprob); 54982cd038dSYoshinobu Inoue switch (code) { 55082cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_NEXTHEADER: 55182cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_HEADER: 55282cd038dSYoshinobu Inoue case ICMP6_PARAMPROB_OPTION: 553fcb3f813SGleb Smirnoff goto deliver; 55482cd038dSYoshinobu Inoue default: 55582cd038dSYoshinobu Inoue goto badcode; 55682cd038dSYoshinobu Inoue } 55782cd038dSYoshinobu Inoue case ICMP6_ECHO_REQUEST: 55829dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echo); 55982cd038dSYoshinobu Inoue if (code != 0) 56082cd038dSYoshinobu Inoue goto badcode; 56132aeee8cSGleb Smirnoff if (icmp6_ratelimit(&ip6->ip6_src, ICMP6_ECHO_REPLY, 0)) 56232aeee8cSGleb Smirnoff break; 563c3bef61eSKevin Lo if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 56482cd038dSYoshinobu Inoue /* Give up remote */ 56582cd038dSYoshinobu Inoue break; 56682cd038dSYoshinobu Inoue } 567f0cace5dSRobert Watson if (!M_WRITABLE(n) 568686cdd19SJun-ichiro itojun Hagino || n->m_len < off + sizeof(struct icmp6_hdr)) { 56982cd038dSYoshinobu Inoue struct mbuf *n0 = n; 5702268ca47SSam Leffler int n0len; 57182cd038dSYoshinobu Inoue 57210e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN); 5737b07d1beSGleb Smirnoff n = m_gethdr(M_NOWAIT, n0->m_type); 57482cd038dSYoshinobu Inoue if (n == NULL) { 57582cd038dSYoshinobu Inoue /* Give up remote */ 57682cd038dSYoshinobu Inoue m_freem(n0); 57782cd038dSYoshinobu Inoue break; 57882cd038dSYoshinobu Inoue } 57910e5acc3SGleb Smirnoff 58010e5acc3SGleb Smirnoff m_move_pkthdr(n, n0); /* FIB copied. */ 58110e5acc3SGleb Smirnoff n0len = n0->m_pkthdr.len; /* save for use below */ 58282cd038dSYoshinobu Inoue /* 58382cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 58482cd038dSYoshinobu Inoue */ 58582cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 58682cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 58782cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 58882cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 58982cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 5902268ca47SSam Leffler /* new mbuf contains only ipv6+icmpv6 headers */ 5912268ca47SSam Leffler n->m_len = noff + sizeof(struct icmp6_hdr); 592686cdd19SJun-ichiro itojun Hagino /* 593686cdd19SJun-ichiro itojun Hagino * Adjust mbuf. ip6_plen will be adjusted in 594686cdd19SJun-ichiro itojun Hagino * ip6_output(). 595686cdd19SJun-ichiro itojun Hagino */ 596686cdd19SJun-ichiro itojun Hagino m_adj(n0, off + sizeof(struct icmp6_hdr)); 5972268ca47SSam Leffler /* recalculate complete packet size */ 5982268ca47SSam Leffler n->m_pkthdr.len = n0len + (noff - off); 599686cdd19SJun-ichiro itojun Hagino n->m_next = n0; 60082cd038dSYoshinobu Inoue } else { 601a4adf6ccSBjoern A. Zeeb if (n->m_len < off + sizeof(*nicmp6)) { 602a61b5cfbSBjoern A. Zeeb n = m_pullup(n, off + sizeof(*nicmp6)); 603a61b5cfbSBjoern A. Zeeb if (n == NULL) { 604a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 605a61b5cfbSBjoern A. Zeeb break; 606a61b5cfbSBjoern A. Zeeb } 607a4adf6ccSBjoern A. Zeeb } 608a61b5cfbSBjoern A. Zeeb nicmp6 = (struct icmp6_hdr *)(mtod(n, caddr_t) + off); 60982cd038dSYoshinobu Inoue noff = off; 61082cd038dSYoshinobu Inoue } 611fb043945SJonathan T. Looney if (n) { 61282cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 61382cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 614e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 615e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]); 61682cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 61782cd038dSYoshinobu Inoue } 61882cd038dSYoshinobu Inoue break; 61982cd038dSYoshinobu Inoue 62082cd038dSYoshinobu Inoue case ICMP6_ECHO_REPLY: 62129dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_echoreply); 62282cd038dSYoshinobu Inoue if (code != 0) 62382cd038dSYoshinobu Inoue goto badcode; 62482cd038dSYoshinobu Inoue break; 62582cd038dSYoshinobu Inoue 62681170631SHajimu UMEMOTO case MLD_LISTENER_QUERY: 62781170631SHajimu UMEMOTO case MLD_LISTENER_REPORT: 62833cde130SBruce M Simpson case MLD_LISTENER_DONE: 62933cde130SBruce M Simpson case MLDV2_LISTENER_REPORT: 63033cde130SBruce M Simpson /* 63129dc7bc6SBruce M Simpson * Drop MLD traffic which is not link-local, has a hop limit 63229dc7bc6SBruce M Simpson * of greater than 1 hop, or which does not have the 63329dc7bc6SBruce M Simpson * IPv6 HBH Router Alert option. 63429dc7bc6SBruce M Simpson * As IPv6 HBH options are stripped in ip6_input() we must 63529dc7bc6SBruce M Simpson * check an mbuf header flag. 63633cde130SBruce M Simpson * XXX Should we also sanity check that these messages 63733cde130SBruce M Simpson * were directed to a link-local multicast prefix? 63833cde130SBruce M Simpson */ 63929dc7bc6SBruce M Simpson if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0) 640686cdd19SJun-ichiro itojun Hagino goto freeit; 64132af08ecSBjoern A. Zeeb if (mld_input(&m, off, icmp6len) != 0) { 642a8fe77d8SBjoern A. Zeeb *mp = NULL; 64333cde130SBruce M Simpson return (IPPROTO_DONE); 644a8fe77d8SBjoern A. Zeeb } 64582cd038dSYoshinobu Inoue /* m stays. */ 64682cd038dSYoshinobu Inoue break; 64782cd038dSYoshinobu Inoue 64882cd038dSYoshinobu Inoue case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 64982cd038dSYoshinobu Inoue { 65082cd038dSYoshinobu Inoue enum { WRU, FQDN } mode; 6517460ef5dSHiroki Sato struct prison *pr; 65282cd038dSYoshinobu Inoue 653603724d3SBjoern A. Zeeb if (!V_icmp6_nodeinfo) 654686cdd19SJun-ichiro itojun Hagino break; 655686cdd19SJun-ichiro itojun Hagino 65682cd038dSYoshinobu Inoue if (icmp6len == sizeof(struct icmp6_hdr) + 4) 65782cd038dSYoshinobu Inoue mode = WRU; 658686cdd19SJun-ichiro itojun Hagino else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 65982cd038dSYoshinobu Inoue mode = FQDN; 66082cd038dSYoshinobu Inoue else 66182cd038dSYoshinobu Inoue goto badlen; 66282cd038dSYoshinobu Inoue 6637460ef5dSHiroki Sato pr = NULL; 6647460ef5dSHiroki Sato sx_slock(&allprison_lock); 6657460ef5dSHiroki Sato TAILQ_FOREACH(pr, &allprison, pr_list) 6667460ef5dSHiroki Sato if (pr->pr_vnet == ifp->if_vnet) 6677460ef5dSHiroki Sato break; 6687460ef5dSHiroki Sato sx_sunlock(&allprison_lock); 6697460ef5dSHiroki Sato if (pr == NULL) 6707460ef5dSHiroki Sato pr = curthread->td_ucred->cr_prison; 67182cd038dSYoshinobu Inoue if (mode == FQDN) { 672a4adf6ccSBjoern A. Zeeb if (m->m_len < off + sizeof(struct icmp6_nodeinfo)) { 673a4adf6ccSBjoern A. Zeeb m = m_pullup(m, off + 674a4adf6ccSBjoern A. Zeeb sizeof(struct icmp6_nodeinfo)); 675a61b5cfbSBjoern A. Zeeb if (m == NULL) { 676a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 677a61b5cfbSBjoern A. Zeeb *mp = m; 678a61b5cfbSBjoern A. Zeeb return (IPPROTO_DONE); 679a61b5cfbSBjoern A. Zeeb } 680a4adf6ccSBjoern A. Zeeb } 681c3bef61eSKevin Lo n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 682686cdd19SJun-ichiro itojun Hagino if (n) 6837460ef5dSHiroki Sato n = ni6_input(n, off, pr); 684686cdd19SJun-ichiro itojun Hagino /* XXX meaningless if n == NULL */ 68582cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 68682cd038dSYoshinobu Inoue } else { 68782cd038dSYoshinobu Inoue u_char *p; 68810e5acc3SGleb Smirnoff int maxhlen, hlen; 68982cd038dSYoshinobu Inoue 69018706985SJINMEI Tatuya /* 69118706985SJINMEI Tatuya * XXX: this combination of flags is pointless, 69218706985SJINMEI Tatuya * but should we keep this for compatibility? 69318706985SJINMEI Tatuya */ 694c81c183dSMark Johnston if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK | 695c81c183dSMark Johnston ICMP6_NODEINFO_TMPADDROK)) != 696c81c183dSMark Johnston (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK)) 69733841545SHajimu UMEMOTO break; 69833841545SHajimu UMEMOTO 699686cdd19SJun-ichiro itojun Hagino if (code != 0) 700686cdd19SJun-ichiro itojun Hagino goto badcode; 70110e5acc3SGleb Smirnoff 70210e5acc3SGleb Smirnoff CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN); 70310e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 70410e5acc3SGleb Smirnoff if (n == NULL) { 705686cdd19SJun-ichiro itojun Hagino /* Give up remote */ 706686cdd19SJun-ichiro itojun Hagino break; 707686cdd19SJun-ichiro itojun Hagino } 70810e5acc3SGleb Smirnoff if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 7099967cafcSSam Leffler /* 7109967cafcSSam Leffler * Previous code did a blind M_COPY_PKTHDR 7119967cafcSSam Leffler * and said "just for rcvif". If true, then 7129967cafcSSam Leffler * we could tolerate the dup failing (due to 7139967cafcSSam Leffler * the deep copy of the tag chain). For now 7149967cafcSSam Leffler * be conservative and just fail. 7159967cafcSSam Leffler */ 7169967cafcSSam Leffler m_free(n); 7179967cafcSSam Leffler n = NULL; 718fb043945SJonathan T. Looney break; 7199967cafcSSam Leffler } 72082cd038dSYoshinobu Inoue /* 72182cd038dSYoshinobu Inoue * Copy IPv6 and ICMPv6 only. 72282cd038dSYoshinobu Inoue */ 72382cd038dSYoshinobu Inoue nip6 = mtod(n, struct ip6_hdr *); 72482cd038dSYoshinobu Inoue bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 72582cd038dSYoshinobu Inoue nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 72682cd038dSYoshinobu Inoue bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 72782cd038dSYoshinobu Inoue p = (u_char *)(nicmp6 + 1); 72882cd038dSYoshinobu Inoue bzero(p, 4); 7297460ef5dSHiroki Sato 7307460ef5dSHiroki Sato maxhlen = M_TRAILINGSPACE(n) - 7317460ef5dSHiroki Sato (sizeof(*nip6) + sizeof(*nicmp6) + 4); 7327460ef5dSHiroki Sato mtx_lock(&pr->pr_mtx); 7337460ef5dSHiroki Sato hlen = strlen(pr->pr_hostname); 7347460ef5dSHiroki Sato if (maxhlen > hlen) 7357460ef5dSHiroki Sato maxhlen = hlen; 736c1f19219SJamie Gritton /* meaningless TTL */ 737c1f19219SJamie Gritton bcopy(pr->pr_hostname, p + 4, maxhlen); 73876ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 73982cd038dSYoshinobu Inoue noff = sizeof(struct ip6_hdr); 74082cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 741686cdd19SJun-ichiro itojun Hagino sizeof(struct icmp6_hdr) + 4 + maxhlen; 74282cd038dSYoshinobu Inoue nicmp6->icmp6_type = ICMP6_WRUREPLY; 74382cd038dSYoshinobu Inoue nicmp6->icmp6_code = 0; 74482cd038dSYoshinobu Inoue } 74582cd038dSYoshinobu Inoue if (n) { 746e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_reflect); 747e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]); 74882cd038dSYoshinobu Inoue icmp6_reflect(n, noff); 74982cd038dSYoshinobu Inoue } 75082cd038dSYoshinobu Inoue break; 75182cd038dSYoshinobu Inoue } 75282cd038dSYoshinobu Inoue 75382cd038dSYoshinobu Inoue case ICMP6_WRUREPLY: 75482cd038dSYoshinobu Inoue if (code != 0) 75582cd038dSYoshinobu Inoue goto badcode; 75682cd038dSYoshinobu Inoue break; 75782cd038dSYoshinobu Inoue 75882cd038dSYoshinobu Inoue case ND_ROUTER_SOLICIT: 75929dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routersolicit); 76082cd038dSYoshinobu Inoue if (code != 0) 76182cd038dSYoshinobu Inoue goto badcode; 76282cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_solicit)) 76382cd038dSYoshinobu Inoue goto badlen; 7641db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 765a4adf6ccSBjoern A. Zeeb if (m->m_len < off + icmp6len) { 766a61b5cfbSBjoern A. Zeeb m = m_pullup(m, off + icmp6len); 767a61b5cfbSBjoern A. Zeeb if (m == NULL) { 768a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 769a61b5cfbSBjoern A. Zeeb *mp = NULL; 770a61b5cfbSBjoern A. Zeeb return (IPPROTO_DONE); 771a61b5cfbSBjoern A. Zeeb } 772a4adf6ccSBjoern A. Zeeb } 7732d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7742d12d25cSMark Johnston if (error == 0) { 775686cdd19SJun-ichiro itojun Hagino m = NULL; 776686cdd19SJun-ichiro itojun Hagino goto freeit; 777686cdd19SJun-ichiro itojun Hagino } 7782d12d25cSMark Johnston } 7792d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 7802d12d25cSMark Johnston nd6_rs_input(m, off, icmp6len); 7812d12d25cSMark Johnston m = n; 7822d12d25cSMark Johnston if (m == NULL) 783e7a6db74SAna Kukec goto freeit; 78482cd038dSYoshinobu Inoue break; 78582cd038dSYoshinobu Inoue 78682cd038dSYoshinobu Inoue case ND_ROUTER_ADVERT: 78729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_routeradvert); 78882cd038dSYoshinobu Inoue if (code != 0) 78982cd038dSYoshinobu Inoue goto badcode; 79082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_router_advert)) 79182cd038dSYoshinobu Inoue goto badlen; 7921db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 7932d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 7942d12d25cSMark Johnston if (error == 0) { 795686cdd19SJun-ichiro itojun Hagino m = NULL; 796686cdd19SJun-ichiro itojun Hagino goto freeit; 797686cdd19SJun-ichiro itojun Hagino } 7982d12d25cSMark Johnston } 7992d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8002d12d25cSMark Johnston nd6_ra_input(m, off, icmp6len); 8012d12d25cSMark Johnston m = n; 8022d12d25cSMark Johnston if (m == NULL) 803e7a6db74SAna Kukec goto freeit; 80482cd038dSYoshinobu Inoue break; 80582cd038dSYoshinobu Inoue 80682cd038dSYoshinobu Inoue case ND_NEIGHBOR_SOLICIT: 80729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit); 80882cd038dSYoshinobu Inoue if (code != 0) 80982cd038dSYoshinobu Inoue goto badcode; 81082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_solicit)) 81182cd038dSYoshinobu Inoue goto badlen; 8121db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 8132d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8142d12d25cSMark Johnston if (error == 0) { 815686cdd19SJun-ichiro itojun Hagino m = NULL; 816686cdd19SJun-ichiro itojun Hagino goto freeit; 817686cdd19SJun-ichiro itojun Hagino } 8182d12d25cSMark Johnston } 8192d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8202d12d25cSMark Johnston nd6_ns_input(m, off, icmp6len); 8212d12d25cSMark Johnston m = n; 8222d12d25cSMark Johnston if (m == NULL) 823e7a6db74SAna Kukec goto freeit; 82482cd038dSYoshinobu Inoue break; 82582cd038dSYoshinobu Inoue 82682cd038dSYoshinobu Inoue case ND_NEIGHBOR_ADVERT: 82729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert); 82882cd038dSYoshinobu Inoue if (code != 0) 82982cd038dSYoshinobu Inoue goto badcode; 83082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_neighbor_advert)) 83182cd038dSYoshinobu Inoue goto badlen; 8321db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 8332d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8342d12d25cSMark Johnston if (error == 0) { 835686cdd19SJun-ichiro itojun Hagino m = NULL; 836686cdd19SJun-ichiro itojun Hagino goto freeit; 837686cdd19SJun-ichiro itojun Hagino } 8382d12d25cSMark Johnston } 8392d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8402d12d25cSMark Johnston nd6_na_input(m, off, icmp6len); 8412d12d25cSMark Johnston m = n; 8422d12d25cSMark Johnston if (m == NULL) 843e7a6db74SAna Kukec goto freeit; 84482cd038dSYoshinobu Inoue break; 84582cd038dSYoshinobu Inoue 84682cd038dSYoshinobu Inoue case ND_REDIRECT: 84729dc7bc6SBruce M Simpson icmp6_ifstat_inc(ifp, ifs6_in_redirect); 84882cd038dSYoshinobu Inoue if (code != 0) 84982cd038dSYoshinobu Inoue goto badcode; 85082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct nd_redirect)) 85182cd038dSYoshinobu Inoue goto badlen; 8521db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 8532d12d25cSMark Johnston error = send_sendso_input_hook(m, ifp, SND_IN, ip6len); 8542d12d25cSMark Johnston if (error == 0) { 855686cdd19SJun-ichiro itojun Hagino m = NULL; 856686cdd19SJun-ichiro itojun Hagino goto freeit; 857686cdd19SJun-ichiro itojun Hagino } 8582d12d25cSMark Johnston } 8592d12d25cSMark Johnston n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 8602d12d25cSMark Johnston icmp6_redirect_input(m, off); 8612d12d25cSMark Johnston m = n; 8622d12d25cSMark Johnston if (m == NULL) 863e7a6db74SAna Kukec goto freeit; 86482cd038dSYoshinobu Inoue break; 86582cd038dSYoshinobu Inoue 86682cd038dSYoshinobu Inoue case ICMP6_ROUTER_RENUMBERING: 86782cd038dSYoshinobu Inoue if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 86882cd038dSYoshinobu Inoue code != ICMP6_ROUTER_RENUMBERING_RESULT) 86982cd038dSYoshinobu Inoue goto badcode; 87082cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_router_renum)) 87182cd038dSYoshinobu Inoue goto badlen; 87282cd038dSYoshinobu Inoue break; 87382cd038dSYoshinobu Inoue 87482cd038dSYoshinobu Inoue default: 87533841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 87633841545SHajimu UMEMOTO "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 8771d54aa3bSBjoern A. Zeeb icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src), 8781d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufd, &ip6->ip6_dst), 87929dc7bc6SBruce M Simpson ifp ? ifp->if_index : 0)); 88082cd038dSYoshinobu Inoue if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 88182cd038dSYoshinobu Inoue /* ICMPv6 error: MUST deliver it by spec... */ 882fcb3f813SGleb Smirnoff goto deliver; 88382cd038dSYoshinobu Inoue } else { 88482cd038dSYoshinobu Inoue /* ICMPv6 informational: MUST not deliver */ 88582cd038dSYoshinobu Inoue break; 88682cd038dSYoshinobu Inoue } 88782cd038dSYoshinobu Inoue deliver: 888fcb3f813SGleb Smirnoff if (icmp6_notify_error(&m, off, icmp6len) != 0) { 88933841545SHajimu UMEMOTO /* In this case, m should've been freed. */ 890a8fe77d8SBjoern A. Zeeb *mp = NULL; 89133841545SHajimu UMEMOTO return (IPPROTO_DONE); 89233841545SHajimu UMEMOTO } 89333841545SHajimu UMEMOTO break; 89433841545SHajimu UMEMOTO 89533841545SHajimu UMEMOTO badcode: 896e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badcode); 89733841545SHajimu UMEMOTO break; 89833841545SHajimu UMEMOTO 89933841545SHajimu UMEMOTO badlen: 900e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badlen); 90133841545SHajimu UMEMOTO break; 90233841545SHajimu UMEMOTO } 90333841545SHajimu UMEMOTO 90433841545SHajimu UMEMOTO /* deliver the packet to appropriate sockets */ 90533841545SHajimu UMEMOTO icmp6_rip6_input(&m, *offp); 90633841545SHajimu UMEMOTO 907a8fe77d8SBjoern A. Zeeb *mp = m; 908a8fe77d8SBjoern A. Zeeb return (IPPROTO_DONE); 90933841545SHajimu UMEMOTO 91033841545SHajimu UMEMOTO freeit: 91133841545SHajimu UMEMOTO m_freem(m); 912a8fe77d8SBjoern A. Zeeb *mp = NULL; 913a8fe77d8SBjoern A. Zeeb return (IPPROTO_DONE); 91433841545SHajimu UMEMOTO } 91533841545SHajimu UMEMOTO 91633841545SHajimu UMEMOTO static int 917fcb3f813SGleb Smirnoff icmp6_notify_error(struct mbuf **mp, int off, int icmp6len) 91833841545SHajimu UMEMOTO { 919503f4e47SBjoern A. Zeeb struct mbuf *m; 92033841545SHajimu UMEMOTO struct icmp6_hdr *icmp6; 92133841545SHajimu UMEMOTO struct ip6_hdr *eip6; 92233841545SHajimu UMEMOTO u_int32_t notifymtu; 92333841545SHajimu UMEMOTO struct sockaddr_in6 icmp6src, icmp6dst; 92433841545SHajimu UMEMOTO 925503f4e47SBjoern A. Zeeb m = *mp; 926503f4e47SBjoern A. Zeeb 92782cd038dSYoshinobu Inoue if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 928e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_tooshort); 92982cd038dSYoshinobu Inoue goto freeit; 93082cd038dSYoshinobu Inoue } 931a61b5cfbSBjoern A. Zeeb 932a4adf6ccSBjoern A. Zeeb if (m->m_len < off + sizeof(*icmp6) + sizeof(struct ip6_hdr)) { 933a61b5cfbSBjoern A. Zeeb m = m_pullup(m, off + sizeof(*icmp6) + sizeof(struct ip6_hdr)); 934a61b5cfbSBjoern A. Zeeb if (m == NULL) { 935a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 936a61b5cfbSBjoern A. Zeeb *mp = m; 93733841545SHajimu UMEMOTO return (-1); 938686cdd19SJun-ichiro itojun Hagino } 939a4adf6ccSBjoern A. Zeeb } 940a61b5cfbSBjoern A. Zeeb icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 94133841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 942d9999ae9SAlexander V. Chernikov bzero(&icmp6dst, sizeof(icmp6dst)); 94382cd038dSYoshinobu Inoue 94482cd038dSYoshinobu Inoue /* Detect the upper level protocol */ 94582cd038dSYoshinobu Inoue { 94682cd038dSYoshinobu Inoue u_int8_t nxt = eip6->ip6_nxt; 94782cd038dSYoshinobu Inoue int eoff = off + sizeof(struct icmp6_hdr) + 94882cd038dSYoshinobu Inoue sizeof(struct ip6_hdr); 94982cd038dSYoshinobu Inoue struct ip6ctlparam ip6cp; 950686cdd19SJun-ichiro itojun Hagino int icmp6type = icmp6->icmp6_type; 951686cdd19SJun-ichiro itojun Hagino struct ip6_frag *fh; 952686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr *rth; 953686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 *rth0; 954686cdd19SJun-ichiro itojun Hagino int rthlen; 95582cd038dSYoshinobu Inoue 95688ff5695SSUZUKI Shinsuke while (1) { /* XXX: should avoid infinite loop explicitly? */ 95782cd038dSYoshinobu Inoue struct ip6_ext *eh; 95882cd038dSYoshinobu Inoue 95982cd038dSYoshinobu Inoue switch (nxt) { 96082cd038dSYoshinobu Inoue case IPPROTO_HOPOPTS: 96182cd038dSYoshinobu Inoue case IPPROTO_DSTOPTS: 96282cd038dSYoshinobu Inoue case IPPROTO_AH: 963a4adf6ccSBjoern A. Zeeb if (m->m_len < eoff + sizeof(struct ip6_ext)) { 964a4adf6ccSBjoern A. Zeeb m = m_pullup(m, eoff + 965a4adf6ccSBjoern A. Zeeb sizeof(struct ip6_ext)); 966a61b5cfbSBjoern A. Zeeb if (m == NULL) { 967a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 968a61b5cfbSBjoern A. Zeeb *mp = m; 96933841545SHajimu UMEMOTO return (-1); 970686cdd19SJun-ichiro itojun Hagino } 971a4adf6ccSBjoern A. Zeeb } 972a61b5cfbSBjoern A. Zeeb eh = (struct ip6_ext *) 973a61b5cfbSBjoern A. Zeeb (mtod(m, caddr_t) + eoff); 97482cd038dSYoshinobu Inoue if (nxt == IPPROTO_AH) 97582cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 2) << 2; 97682cd038dSYoshinobu Inoue else 97782cd038dSYoshinobu Inoue eoff += (eh->ip6e_len + 1) << 3; 97882cd038dSYoshinobu Inoue nxt = eh->ip6e_nxt; 97982cd038dSYoshinobu Inoue break; 980686cdd19SJun-ichiro itojun Hagino case IPPROTO_ROUTING: 981686cdd19SJun-ichiro itojun Hagino /* 982686cdd19SJun-ichiro itojun Hagino * When the erroneous packet contains a 983686cdd19SJun-ichiro itojun Hagino * routing header, we should examine the 984686cdd19SJun-ichiro itojun Hagino * header to determine the final destination. 985686cdd19SJun-ichiro itojun Hagino * Otherwise, we can't properly update 986686cdd19SJun-ichiro itojun Hagino * information that depends on the final 987686cdd19SJun-ichiro itojun Hagino * destination (e.g. path MTU). 988686cdd19SJun-ichiro itojun Hagino */ 989a4adf6ccSBjoern A. Zeeb if (m->m_len < eoff + sizeof(*rth)) { 990a61b5cfbSBjoern A. Zeeb m = m_pullup(m, eoff + sizeof(*rth)); 991a61b5cfbSBjoern A. Zeeb if (m == NULL) { 992a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 993a61b5cfbSBjoern A. Zeeb *mp = m; 99433841545SHajimu UMEMOTO return (-1); 995686cdd19SJun-ichiro itojun Hagino } 996a4adf6ccSBjoern A. Zeeb } 997a61b5cfbSBjoern A. Zeeb rth = (struct ip6_rthdr *) 998a61b5cfbSBjoern A. Zeeb (mtod(m, caddr_t) + eoff); 999686cdd19SJun-ichiro itojun Hagino rthlen = (rth->ip6r_len + 1) << 3; 1000686cdd19SJun-ichiro itojun Hagino /* 1001686cdd19SJun-ichiro itojun Hagino * XXX: currently there is no 1002686cdd19SJun-ichiro itojun Hagino * officially defined type other 1003686cdd19SJun-ichiro itojun Hagino * than type-0. 1004686cdd19SJun-ichiro itojun Hagino * Note that if the segment left field 1005686cdd19SJun-ichiro itojun Hagino * is 0, all intermediate hops must 1006686cdd19SJun-ichiro itojun Hagino * have been passed. 1007686cdd19SJun-ichiro itojun Hagino */ 1008686cdd19SJun-ichiro itojun Hagino if (rth->ip6r_segleft && 1009686cdd19SJun-ichiro itojun Hagino rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1010686cdd19SJun-ichiro itojun Hagino int hops; 1011686cdd19SJun-ichiro itojun Hagino 1012a4adf6ccSBjoern A. Zeeb if (m->m_len < eoff + rthlen) { 1013a61b5cfbSBjoern A. Zeeb m = m_pullup(m, eoff + rthlen); 1014a61b5cfbSBjoern A. Zeeb if (m == NULL) { 1015a4adf6ccSBjoern A. Zeeb IP6STAT_INC( 1016a4adf6ccSBjoern A. Zeeb ip6s_exthdrtoolong); 1017a61b5cfbSBjoern A. Zeeb *mp = m; 101833841545SHajimu UMEMOTO return (-1); 1019686cdd19SJun-ichiro itojun Hagino } 1020a4adf6ccSBjoern A. Zeeb } 1021a61b5cfbSBjoern A. Zeeb rth0 = (struct ip6_rthdr0 *) 1022a61b5cfbSBjoern A. Zeeb (mtod(m, caddr_t) + eoff); 1023d9999ae9SAlexander V. Chernikov 1024686cdd19SJun-ichiro itojun Hagino /* just ignore a bogus header */ 1025686cdd19SJun-ichiro itojun Hagino if ((rth0->ip6r0_len % 2) == 0 && 1026686cdd19SJun-ichiro itojun Hagino (hops = rth0->ip6r0_len/2)) 1027d9999ae9SAlexander V. Chernikov icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1)); 1028686cdd19SJun-ichiro itojun Hagino } 1029686cdd19SJun-ichiro itojun Hagino eoff += rthlen; 1030686cdd19SJun-ichiro itojun Hagino nxt = rth->ip6r_nxt; 1031686cdd19SJun-ichiro itojun Hagino break; 1032686cdd19SJun-ichiro itojun Hagino case IPPROTO_FRAGMENT: 1033a4adf6ccSBjoern A. Zeeb if (m->m_len < eoff + sizeof(struct ip6_frag)) { 1034a4adf6ccSBjoern A. Zeeb m = m_pullup(m, eoff + 1035a4adf6ccSBjoern A. Zeeb sizeof(struct ip6_frag)); 1036a61b5cfbSBjoern A. Zeeb if (m == NULL) { 1037a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 1038a61b5cfbSBjoern A. Zeeb *mp = m; 103933841545SHajimu UMEMOTO return (-1); 1040686cdd19SJun-ichiro itojun Hagino } 1041a4adf6ccSBjoern A. Zeeb } 1042a61b5cfbSBjoern A. Zeeb fh = (struct ip6_frag *)(mtod(m, caddr_t) + 1043a61b5cfbSBjoern A. Zeeb eoff); 1044686cdd19SJun-ichiro itojun Hagino /* 1045686cdd19SJun-ichiro itojun Hagino * Data after a fragment header is meaningless 1046686cdd19SJun-ichiro itojun Hagino * unless it is the first fragment, but 1047686cdd19SJun-ichiro itojun Hagino * we'll go to the notify label for path MTU 1048686cdd19SJun-ichiro itojun Hagino * discovery. 1049686cdd19SJun-ichiro itojun Hagino */ 1050686cdd19SJun-ichiro itojun Hagino if (fh->ip6f_offlg & IP6F_OFF_MASK) 1051686cdd19SJun-ichiro itojun Hagino goto notify; 1052686cdd19SJun-ichiro itojun Hagino 1053686cdd19SJun-ichiro itojun Hagino eoff += sizeof(struct ip6_frag); 1054686cdd19SJun-ichiro itojun Hagino nxt = fh->ip6f_nxt; 1055686cdd19SJun-ichiro itojun Hagino break; 105682cd038dSYoshinobu Inoue default: 1057686cdd19SJun-ichiro itojun Hagino /* 1058686cdd19SJun-ichiro itojun Hagino * This case includes ESP and the No Next 1059686cdd19SJun-ichiro itojun Hagino * Header. In such cases going to the notify 1060686cdd19SJun-ichiro itojun Hagino * label does not have any meaning 1061686cdd19SJun-ichiro itojun Hagino * (i.e. ctlfunc will be NULL), but we go 1062686cdd19SJun-ichiro itojun Hagino * anyway since we might have to update 1063686cdd19SJun-ichiro itojun Hagino * path MTU information. 1064686cdd19SJun-ichiro itojun Hagino */ 106582cd038dSYoshinobu Inoue goto notify; 106682cd038dSYoshinobu Inoue } 106782cd038dSYoshinobu Inoue } 106882cd038dSYoshinobu Inoue notify: 106982cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 107033841545SHajimu UMEMOTO 107106cd0a3fSHajimu UMEMOTO /* 107206cd0a3fSHajimu UMEMOTO * retrieve parameters from the inner IPv6 header, and convert 107306cd0a3fSHajimu UMEMOTO * them into sockaddr structures. 107406cd0a3fSHajimu UMEMOTO * XXX: there is no guarantee that the source or destination 107506cd0a3fSHajimu UMEMOTO * addresses of the inner packet are in the same scope as 107606cd0a3fSHajimu UMEMOTO * the addresses of the icmp packet. But there is no other 107706cd0a3fSHajimu UMEMOTO * way to determine the zone. 107806cd0a3fSHajimu UMEMOTO */ 107933841545SHajimu UMEMOTO eip6 = (struct ip6_hdr *)(icmp6 + 1); 108006cd0a3fSHajimu UMEMOTO 1081aa71d6b4SMark Johnston /* 1082aa71d6b4SMark Johnston * Protocol layers can't do anything useful with unspecified 1083aa71d6b4SMark Johnston * addresses. 1084aa71d6b4SMark Johnston */ 1085aa71d6b4SMark Johnston if (IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_src) || 1086aa71d6b4SMark Johnston IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_dst)) 1087aa71d6b4SMark Johnston goto freeit; 1088aa71d6b4SMark Johnston 108933841545SHajimu UMEMOTO icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 109033841545SHajimu UMEMOTO icmp6dst.sin6_family = AF_INET6; 1091d9999ae9SAlexander V. Chernikov if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr)) 109233841545SHajimu UMEMOTO icmp6dst.sin6_addr = eip6->ip6_dst; 1093a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 10949a4f9608SHajimu UMEMOTO goto freeit; 109533841545SHajimu UMEMOTO bzero(&icmp6src, sizeof(icmp6src)); 109633841545SHajimu UMEMOTO icmp6src.sin6_len = sizeof(struct sockaddr_in6); 109733841545SHajimu UMEMOTO icmp6src.sin6_family = AF_INET6; 109833841545SHajimu UMEMOTO icmp6src.sin6_addr = eip6->ip6_src; 1099a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 11009a4f9608SHajimu UMEMOTO goto freeit; 1101a1f7e5f8SHajimu UMEMOTO icmp6src.sin6_flowinfo = 1102a1f7e5f8SHajimu UMEMOTO (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 110333841545SHajimu UMEMOTO 110433841545SHajimu UMEMOTO ip6cp.ip6c_m = m; 110533841545SHajimu UMEMOTO ip6cp.ip6c_icmp6 = icmp6; 110633841545SHajimu UMEMOTO ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 110733841545SHajimu UMEMOTO ip6cp.ip6c_off = eoff; 1108fcb3f813SGleb Smirnoff ip6cp.ip6c_finaldst = &icmp6dst; 110933841545SHajimu UMEMOTO ip6cp.ip6c_src = &icmp6src; 111033841545SHajimu UMEMOTO ip6cp.ip6c_nxt = nxt; 111133841545SHajimu UMEMOTO 111233841545SHajimu UMEMOTO if (icmp6type == ICMP6_PACKET_TOO_BIG) { 111333841545SHajimu UMEMOTO notifymtu = ntohl(icmp6->icmp6_mtu); 111433841545SHajimu UMEMOTO ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 111533841545SHajimu UMEMOTO icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1116686cdd19SJun-ichiro itojun Hagino } 1117686cdd19SJun-ichiro itojun Hagino 111878b1fc05SGleb Smirnoff if (ip6_ctlprotox[nxt] != NULL) 1119fcb3f813SGleb Smirnoff ip6_ctlprotox[nxt](&ip6cp); 112082cd038dSYoshinobu Inoue } 11219c0fda72SHajimu UMEMOTO *mp = m; 112233841545SHajimu UMEMOTO return (0); 112382cd038dSYoshinobu Inoue 112482cd038dSYoshinobu Inoue freeit: 112582cd038dSYoshinobu Inoue m_freem(m); 1126a8fe77d8SBjoern A. Zeeb *mp = NULL; 112733841545SHajimu UMEMOTO return (-1); 112882cd038dSYoshinobu Inoue } 112982cd038dSYoshinobu Inoue 113033841545SHajimu UMEMOTO void 11311272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1132686cdd19SJun-ichiro itojun Hagino { 1133fcb3f813SGleb Smirnoff struct in6_addr *dst = &ip6cp->ip6c_finaldst->sin6_addr; 113433841545SHajimu UMEMOTO struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 113533841545SHajimu UMEMOTO struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1136686cdd19SJun-ichiro itojun Hagino u_int mtu = ntohl(icmp6->icmp6_mtu); 113797d8d152SAndre Oppermann struct in_conninfo inc; 113882042465SKornel Dulęba uint32_t max_mtu; 1139686cdd19SJun-ichiro itojun Hagino 1140f95d4633SHajimu UMEMOTO #if 0 1141f95d4633SHajimu UMEMOTO /* 1142f95d4633SHajimu UMEMOTO * RFC2460 section 5, last paragraph. 1143f95d4633SHajimu UMEMOTO * even though minimum link MTU for IPv6 is IPV6_MMTU, 1144f95d4633SHajimu UMEMOTO * we may see ICMPv6 too big with mtu < IPV6_MMTU 1145f95d4633SHajimu UMEMOTO * due to packet translator in the middle. 1146f95d4633SHajimu UMEMOTO * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1147f95d4633SHajimu UMEMOTO * special handling. 1148f95d4633SHajimu UMEMOTO */ 1149f95d4633SHajimu UMEMOTO if (mtu < IPV6_MMTU) 1150f95d4633SHajimu UMEMOTO return; 1151f95d4633SHajimu UMEMOTO #endif 1152f95d4633SHajimu UMEMOTO 1153f95d4633SHajimu UMEMOTO /* 1154f95d4633SHajimu UMEMOTO * we reject ICMPv6 too big with abnormally small value. 1155f95d4633SHajimu UMEMOTO * XXX what is the good definition of "abnormally small"? 1156f95d4633SHajimu UMEMOTO */ 1157f95d4633SHajimu UMEMOTO if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1158f95d4633SHajimu UMEMOTO return; 1159f95d4633SHajimu UMEMOTO 116033841545SHajimu UMEMOTO if (!validated) 116133841545SHajimu UMEMOTO return; 116233841545SHajimu UMEMOTO 116359ca51adSSimon L. B. Nielsen /* 116459ca51adSSimon L. B. Nielsen * In case the suggested mtu is less than IPV6_MMTU, we 116559ca51adSSimon L. B. Nielsen * only need to remember that it was for above mentioned 116659ca51adSSimon L. B. Nielsen * "alwaysfrag" case. 116759ca51adSSimon L. B. Nielsen * Try to be as close to the spec as possible. 116859ca51adSSimon L. B. Nielsen */ 116959ca51adSSimon L. B. Nielsen if (mtu < IPV6_MMTU) 117059ca51adSSimon L. B. Nielsen mtu = IPV6_MMTU - 8; 117159ca51adSSimon L. B. Nielsen 117297d8d152SAndre Oppermann bzero(&inc, sizeof(inc)); 1173baa09f18SAndrey V. Elsukov inc.inc_fibnum = M_GETFIB(m); 1174dcdb4371SBjoern A. Zeeb inc.inc_flags |= INC_ISIPV6; 117597d8d152SAndre Oppermann inc.inc6_faddr = *dst; 1176a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL)) 1177a1f7e5f8SHajimu UMEMOTO return; 1178686cdd19SJun-ichiro itojun Hagino 117982042465SKornel Dulęba max_mtu = tcp_hc_getmtu(&inc); 118082042465SKornel Dulęba if (max_mtu == 0) 118182042465SKornel Dulęba max_mtu = tcp_maxmtu6(&inc, NULL); 118282042465SKornel Dulęba 118382042465SKornel Dulęba if (mtu < max_mtu) { 118497d8d152SAndre Oppermann tcp_hc_updatemtu(&inc, mtu); 1185e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_pmtuchg); 1186686cdd19SJun-ichiro itojun Hagino } 1187686cdd19SJun-ichiro itojun Hagino } 1188686cdd19SJun-ichiro itojun Hagino 118982cd038dSYoshinobu Inoue /* 119033841545SHajimu UMEMOTO * Process a Node Information Query packet, based on 119133841545SHajimu UMEMOTO * draft-ietf-ipngwg-icmp-name-lookups-07. 1192686cdd19SJun-ichiro itojun Hagino * 1193686cdd19SJun-ichiro itojun Hagino * Spec incompatibilities: 1194686cdd19SJun-ichiro itojun Hagino * - IPv6 Subject address handling 1195686cdd19SJun-ichiro itojun Hagino * - IPv4 Subject address handling support missing 1196686cdd19SJun-ichiro itojun Hagino * - Proxy reply (answer even if it's not for me) 1197686cdd19SJun-ichiro itojun Hagino * - joins NI group address at in6_ifattach() time only, does not cope 1198686cdd19SJun-ichiro itojun Hagino * with hostname changes by sethostname(3) 119982cd038dSYoshinobu Inoue */ 120082cd038dSYoshinobu Inoue static struct mbuf * 12017460ef5dSHiroki Sato ni6_input(struct mbuf *m, int off, struct prison *pr) 120282cd038dSYoshinobu Inoue { 1203686cdd19SJun-ichiro itojun Hagino struct icmp6_nodeinfo *ni6, *nni6; 120482cd038dSYoshinobu Inoue struct mbuf *n = NULL; 1205686cdd19SJun-ichiro itojun Hagino u_int16_t qtype; 1206686cdd19SJun-ichiro itojun Hagino int subjlen; 120782cd038dSYoshinobu Inoue int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 120882cd038dSYoshinobu Inoue struct ni_reply_fqdn *fqdn; 120982cd038dSYoshinobu Inoue int addrs; /* for NI_QTYPE_NODEADDR */ 121082cd038dSYoshinobu Inoue struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1211a1f7e5f8SHajimu UMEMOTO struct in6_addr in6_subj; /* subject address */ 1212686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 1213686cdd19SJun-ichiro itojun Hagino int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 121433841545SHajimu UMEMOTO char *subj = NULL; 121533841545SHajimu UMEMOTO struct in6_ifaddr *ia6 = NULL; 121682cd038dSYoshinobu Inoue 1217686cdd19SJun-ichiro itojun Hagino ip6 = mtod(m, struct ip6_hdr *); 1218686cdd19SJun-ichiro itojun Hagino ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1219686cdd19SJun-ichiro itojun Hagino 1220686cdd19SJun-ichiro itojun Hagino /* 122118706985SJINMEI Tatuya * Validate IPv6 source address. 122218706985SJINMEI Tatuya * The default configuration MUST be to refuse answering queries from 122318706985SJINMEI Tatuya * global-scope addresses according to RFC4602. 122418706985SJINMEI Tatuya * Notes: 122518706985SJINMEI Tatuya * - it's not very clear what "refuse" means; this implementation 122618706985SJINMEI Tatuya * simply drops it. 122718706985SJINMEI Tatuya * - it's not very easy to identify global-scope (unicast) addresses 122818706985SJINMEI Tatuya * since there are many prefixes for them. It should be safer 122918706985SJINMEI Tatuya * and in practice sufficient to check "all" but loopback and 123018706985SJINMEI Tatuya * link-local (note that site-local unicast was deprecated and 123118706985SJINMEI Tatuya * ULA is defined as global scope-wise) 123218706985SJINMEI Tatuya */ 1233603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && 123418706985SJINMEI Tatuya !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && 123518706985SJINMEI Tatuya !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 123618706985SJINMEI Tatuya goto bad; 123718706985SJINMEI Tatuya 123818706985SJINMEI Tatuya /* 1239686cdd19SJun-ichiro itojun Hagino * Validate IPv6 destination address. 1240686cdd19SJun-ichiro itojun Hagino * 124133841545SHajimu UMEMOTO * The Responder must discard the Query without further processing 124233841545SHajimu UMEMOTO * unless it is one of the Responder's unicast or anycast addresses, or 124333841545SHajimu UMEMOTO * a link-local scope multicast address which the Responder has joined. 124418706985SJINMEI Tatuya * [RFC4602, Section 5.] 1245686cdd19SJun-ichiro itojun Hagino */ 12462a5aafceSHajimu UMEMOTO if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 12472a5aafceSHajimu UMEMOTO if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 12482a5aafceSHajimu UMEMOTO goto bad; 12492a5aafceSHajimu UMEMOTO /* else it's a link-local multicast, fine */ 12502a5aafceSHajimu UMEMOTO } else { /* unicast or anycast */ 12518268d82cSAlexander V. Chernikov ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 12523e88eb90SAndrey V. Elsukov if (ia6 == NULL) 12532a5aafceSHajimu UMEMOTO goto bad; /* XXX impossible */ 12542a5aafceSHajimu UMEMOTO 12552a5aafceSHajimu UMEMOTO if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1256603724d3SBjoern A. Zeeb !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { 125733841545SHajimu UMEMOTO nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 125833841545SHajimu UMEMOTO "a temporary address in %s:%d", 125933841545SHajimu UMEMOTO __FILE__, __LINE__)); 126033841545SHajimu UMEMOTO goto bad; 126133841545SHajimu UMEMOTO } 12622a5aafceSHajimu UMEMOTO } 1263686cdd19SJun-ichiro itojun Hagino 1264686cdd19SJun-ichiro itojun Hagino /* validate query Subject field. */ 126533841545SHajimu UMEMOTO qtype = ntohs(ni6->ni_qtype); 1266686cdd19SJun-ichiro itojun Hagino subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1267686cdd19SJun-ichiro itojun Hagino switch (qtype) { 1268686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NOOP: 1269686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_SUPTYPES: 127033841545SHajimu UMEMOTO /* 07 draft */ 127133841545SHajimu UMEMOTO if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1272686cdd19SJun-ichiro itojun Hagino break; 127333841545SHajimu UMEMOTO /* FALLTHROUGH */ 1274686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_FQDN: 1275686cdd19SJun-ichiro itojun Hagino case NI_QTYPE_NODEADDR: 1276a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1277686cdd19SJun-ichiro itojun Hagino switch (ni6->ni_code) { 1278686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_IPV6: 1279686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0 1280686cdd19SJun-ichiro itojun Hagino case 0: 1281686cdd19SJun-ichiro itojun Hagino #endif 1282686cdd19SJun-ichiro itojun Hagino /* 1283686cdd19SJun-ichiro itojun Hagino * backward compatibility - try to accept 03 draft 1284686cdd19SJun-ichiro itojun Hagino * format, where no Subject is present. 1285686cdd19SJun-ichiro itojun Hagino */ 128633841545SHajimu UMEMOTO if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 128733841545SHajimu UMEMOTO subjlen == 0) { 1288686cdd19SJun-ichiro itojun Hagino oldfqdn++; 1289686cdd19SJun-ichiro itojun Hagino break; 1290686cdd19SJun-ichiro itojun Hagino } 129133841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0 129233841545SHajimu UMEMOTO if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 129333841545SHajimu UMEMOTO goto bad; 129433841545SHajimu UMEMOTO #endif 1295686cdd19SJun-ichiro itojun Hagino 12962a5aafceSHajimu UMEMOTO if (subjlen != sizeof(struct in6_addr)) 1297686cdd19SJun-ichiro itojun Hagino goto bad; 1298686cdd19SJun-ichiro itojun Hagino 1299686cdd19SJun-ichiro itojun Hagino /* 1300686cdd19SJun-ichiro itojun Hagino * Validate Subject address. 1301686cdd19SJun-ichiro itojun Hagino * 130233841545SHajimu UMEMOTO * Not sure what exactly "address belongs to the node" 130333841545SHajimu UMEMOTO * means in the spec, is it just unicast, or what? 1304686cdd19SJun-ichiro itojun Hagino * 1305686cdd19SJun-ichiro itojun Hagino * At this moment we consider Subject address as 1306686cdd19SJun-ichiro itojun Hagino * "belong to the node" if the Subject address equals 1307686cdd19SJun-ichiro itojun Hagino * to the IPv6 destination address; validation for 1308686cdd19SJun-ichiro itojun Hagino * IPv6 destination address should have done enough 1309686cdd19SJun-ichiro itojun Hagino * check for us. 1310686cdd19SJun-ichiro itojun Hagino * 1311686cdd19SJun-ichiro itojun Hagino * We do not do proxy at this moment. 1312686cdd19SJun-ichiro itojun Hagino */ 1313686cdd19SJun-ichiro itojun Hagino m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1314a1f7e5f8SHajimu UMEMOTO subjlen, (caddr_t)&in6_subj); 1315a1f7e5f8SHajimu UMEMOTO if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) 13169a4f9608SHajimu UMEMOTO goto bad; 13172a5aafceSHajimu UMEMOTO 1318a1f7e5f8SHajimu UMEMOTO subj = (char *)&in6_subj; 1319a1f7e5f8SHajimu UMEMOTO if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1320686cdd19SJun-ichiro itojun Hagino break; 132133841545SHajimu UMEMOTO 1322686cdd19SJun-ichiro itojun Hagino /* 1323686cdd19SJun-ichiro itojun Hagino * XXX if we are to allow other cases, we should really 1324686cdd19SJun-ichiro itojun Hagino * be careful about scope here. 1325686cdd19SJun-ichiro itojun Hagino * basically, we should disallow queries toward IPv6 132606cd0a3fSHajimu UMEMOTO * destination X with subject Y, 132706cd0a3fSHajimu UMEMOTO * if scope(X) > scope(Y). 1328686cdd19SJun-ichiro itojun Hagino * if we allow scope(X) > scope(Y), it will result in 1329686cdd19SJun-ichiro itojun Hagino * information leakage across scope boundary. 1330686cdd19SJun-ichiro itojun Hagino */ 1331686cdd19SJun-ichiro itojun Hagino goto bad; 1332686cdd19SJun-ichiro itojun Hagino 1333686cdd19SJun-ichiro itojun Hagino case ICMP6_NI_SUBJ_FQDN: 1334686cdd19SJun-ichiro itojun Hagino /* 1335686cdd19SJun-ichiro itojun Hagino * Validate Subject name with gethostname(3). 1336686cdd19SJun-ichiro itojun Hagino * 1337686cdd19SJun-ichiro itojun Hagino * The behavior may need some debate, since: 1338686cdd19SJun-ichiro itojun Hagino * - we are not sure if the node has FQDN as 1339686cdd19SJun-ichiro itojun Hagino * hostname (returned by gethostname(3)). 1340686cdd19SJun-ichiro itojun Hagino * - the code does wildcard match for truncated names. 1341686cdd19SJun-ichiro itojun Hagino * however, we are not sure if we want to perform 1342686cdd19SJun-ichiro itojun Hagino * wildcard match, if gethostname(3) side has 1343686cdd19SJun-ichiro itojun Hagino * truncated hostname. 1344686cdd19SJun-ichiro itojun Hagino */ 134576ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1346c1f19219SJamie Gritton n = ni6_nametodns(pr->pr_hostname, 1347c1f19219SJamie Gritton strlen(pr->pr_hostname), 0); 134876ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1349686cdd19SJun-ichiro itojun Hagino if (!n || n->m_next || n->m_len == 0) 1350686cdd19SJun-ichiro itojun Hagino goto bad; 1351a4adf6ccSBjoern A. Zeeb if (m->m_len < off + sizeof(struct icmp6_nodeinfo) + 1352a4adf6ccSBjoern A. Zeeb subjlen) { 1353a4adf6ccSBjoern A. Zeeb m = m_pullup(m, off + 1354a4adf6ccSBjoern A. Zeeb sizeof(struct icmp6_nodeinfo) + subjlen); 1355a61b5cfbSBjoern A. Zeeb if (m == NULL) { 1356a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 1357686cdd19SJun-ichiro itojun Hagino goto bad; 1358a61b5cfbSBjoern A. Zeeb } 1359a4adf6ccSBjoern A. Zeeb } 1360a61b5cfbSBjoern A. Zeeb /* ip6 possibly invalid but not used after. */ 1361a61b5cfbSBjoern A. Zeeb ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1362a61b5cfbSBjoern A. Zeeb subj = (char *)(mtod(m, caddr_t) + off + 1363a61b5cfbSBjoern A. Zeeb sizeof(struct icmp6_nodeinfo)); 1364686cdd19SJun-ichiro itojun Hagino if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1365686cdd19SJun-ichiro itojun Hagino n->m_len)) { 1366686cdd19SJun-ichiro itojun Hagino goto bad; 1367686cdd19SJun-ichiro itojun Hagino } 1368686cdd19SJun-ichiro itojun Hagino m_freem(n); 1369686cdd19SJun-ichiro itojun Hagino n = NULL; 1370686cdd19SJun-ichiro itojun Hagino break; 1371686cdd19SJun-ichiro itojun Hagino 137233841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1373686cdd19SJun-ichiro itojun Hagino default: 1374686cdd19SJun-ichiro itojun Hagino goto bad; 1375686cdd19SJun-ichiro itojun Hagino } 1376686cdd19SJun-ichiro itojun Hagino break; 1377686cdd19SJun-ichiro itojun Hagino } 1378686cdd19SJun-ichiro itojun Hagino 137933841545SHajimu UMEMOTO /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 138033841545SHajimu UMEMOTO switch (qtype) { 138133841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 1382603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 138333841545SHajimu UMEMOTO goto bad; 138433841545SHajimu UMEMOTO break; 138533841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1386a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1387603724d3SBjoern A. Zeeb if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 138833841545SHajimu UMEMOTO goto bad; 138933841545SHajimu UMEMOTO break; 139033841545SHajimu UMEMOTO } 139133841545SHajimu UMEMOTO 139233841545SHajimu UMEMOTO /* guess reply length */ 139333841545SHajimu UMEMOTO switch (qtype) { 139433841545SHajimu UMEMOTO case NI_QTYPE_NOOP: 139533841545SHajimu UMEMOTO break; /* no reply data */ 139633841545SHajimu UMEMOTO case NI_QTYPE_SUPTYPES: 139733841545SHajimu UMEMOTO replylen += sizeof(u_int32_t); 139833841545SHajimu UMEMOTO break; 139933841545SHajimu UMEMOTO case NI_QTYPE_FQDN: 140033841545SHajimu UMEMOTO /* XXX will append an mbuf */ 140133841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 140233841545SHajimu UMEMOTO break; 140333841545SHajimu UMEMOTO case NI_QTYPE_NODEADDR: 1404c66b5feaSHajimu UMEMOTO addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj); 140533841545SHajimu UMEMOTO if ((replylen += addrs * (sizeof(struct in6_addr) + 140633841545SHajimu UMEMOTO sizeof(u_int32_t))) > MCLBYTES) 140733841545SHajimu UMEMOTO replylen = MCLBYTES; /* XXX: will truncate pkt later */ 140833841545SHajimu UMEMOTO break; 1409a22adbc6SSUZUKI Shinsuke case NI_QTYPE_IPV4ADDR: 1410a22adbc6SSUZUKI Shinsuke /* unsupported - should respond with unknown Qtype? */ 1411a22adbc6SSUZUKI Shinsuke break; 141233841545SHajimu UMEMOTO default: 141333841545SHajimu UMEMOTO /* 141433841545SHajimu UMEMOTO * XXX: We must return a reply with the ICMP6 code 141533841545SHajimu UMEMOTO * `unknown Qtype' in this case. However we regard the case 141633841545SHajimu UMEMOTO * as an FQDN query for backward compatibility. 141733841545SHajimu UMEMOTO * Older versions set a random value to this field, 141833841545SHajimu UMEMOTO * so it rarely varies in the defined qtypes. 141933841545SHajimu UMEMOTO * But the mechanism is not reliable... 142033841545SHajimu UMEMOTO * maybe we should obsolete older versions. 142133841545SHajimu UMEMOTO */ 142233841545SHajimu UMEMOTO qtype = NI_QTYPE_FQDN; 142333841545SHajimu UMEMOTO /* XXX will append an mbuf */ 142433841545SHajimu UMEMOTO replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 142533841545SHajimu UMEMOTO oldfqdn++; 142633841545SHajimu UMEMOTO break; 142733841545SHajimu UMEMOTO } 142833841545SHajimu UMEMOTO 142910e5acc3SGleb Smirnoff /* Allocate an mbuf to reply. */ 1430686cdd19SJun-ichiro itojun Hagino if (replylen > MCLBYTES) { 143182cd038dSYoshinobu Inoue /* 143233841545SHajimu UMEMOTO * XXX: should we try to allocate more? But MCLBYTES 143333841545SHajimu UMEMOTO * is probably much larger than IPV6_MMTU... 143482cd038dSYoshinobu Inoue */ 143582cd038dSYoshinobu Inoue goto bad; 1436686cdd19SJun-ichiro itojun Hagino } 143710e5acc3SGleb Smirnoff if (replylen > MHLEN) 143810e5acc3SGleb Smirnoff n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR); 143910e5acc3SGleb Smirnoff else 144010e5acc3SGleb Smirnoff n = m_gethdr(M_NOWAIT, m->m_type); 144110e5acc3SGleb Smirnoff if (n == NULL) { 144210e5acc3SGleb Smirnoff m_freem(m); 144310e5acc3SGleb Smirnoff return (NULL); 144482cd038dSYoshinobu Inoue } 144510e5acc3SGleb Smirnoff m_move_pkthdr(n, m); /* just for recvif and FIB */ 144682cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = replylen; 144782cd038dSYoshinobu Inoue 144882cd038dSYoshinobu Inoue /* copy mbuf header and IPv6 + Node Information base headers */ 144982cd038dSYoshinobu Inoue bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 145082cd038dSYoshinobu Inoue nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1451686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 145282cd038dSYoshinobu Inoue 145382cd038dSYoshinobu Inoue /* qtype dependent procedure */ 145482cd038dSYoshinobu Inoue switch (qtype) { 145582cd038dSYoshinobu Inoue case NI_QTYPE_NOOP: 145633841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 145782cd038dSYoshinobu Inoue nni6->ni_flags = 0; 145882cd038dSYoshinobu Inoue break; 145982cd038dSYoshinobu Inoue case NI_QTYPE_SUPTYPES: 146033841545SHajimu UMEMOTO { 146133841545SHajimu UMEMOTO u_int32_t v; 146233841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 146333841545SHajimu UMEMOTO nni6->ni_flags = htons(0x0000); /* raw bitmap */ 146433841545SHajimu UMEMOTO /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 146533841545SHajimu UMEMOTO v = (u_int32_t)htonl(0x0000000f); 146633841545SHajimu UMEMOTO bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 146782cd038dSYoshinobu Inoue break; 146833841545SHajimu UMEMOTO } 146982cd038dSYoshinobu Inoue case NI_QTYPE_FQDN: 147033841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 147182cd038dSYoshinobu Inoue fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 147206cd0a3fSHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 147382cd038dSYoshinobu Inoue nni6->ni_flags = 0; /* XXX: meaningless TTL */ 147482cd038dSYoshinobu Inoue fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1475686cdd19SJun-ichiro itojun Hagino /* 147676ca6f88SJamie Gritton * XXX do we really have FQDN in hostname? 1477686cdd19SJun-ichiro itojun Hagino */ 147876ca6f88SJamie Gritton mtx_lock(&pr->pr_mtx); 1479c1f19219SJamie Gritton n->m_next = ni6_nametodns(pr->pr_hostname, 1480c1f19219SJamie Gritton strlen(pr->pr_hostname), oldfqdn); 148176ca6f88SJamie Gritton mtx_unlock(&pr->pr_mtx); 1482686cdd19SJun-ichiro itojun Hagino if (n->m_next == NULL) 1483686cdd19SJun-ichiro itojun Hagino goto bad; 1484686cdd19SJun-ichiro itojun Hagino /* XXX we assume that n->m_next is not a chain */ 1485686cdd19SJun-ichiro itojun Hagino if (n->m_next->m_next != NULL) 1486686cdd19SJun-ichiro itojun Hagino goto bad; 1487686cdd19SJun-ichiro itojun Hagino n->m_pkthdr.len += n->m_next->m_len; 148882cd038dSYoshinobu Inoue break; 148982cd038dSYoshinobu Inoue case NI_QTYPE_NODEADDR: 149082cd038dSYoshinobu Inoue { 149182cd038dSYoshinobu Inoue int lenlim, copied; 149282cd038dSYoshinobu Inoue 149333841545SHajimu UMEMOTO nni6->ni_code = ICMP6_NI_SUCCESS; 149433841545SHajimu UMEMOTO n->m_pkthdr.len = n->m_len = 149533841545SHajimu UMEMOTO sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 149633841545SHajimu UMEMOTO lenlim = M_TRAILINGSPACE(n); 149782cd038dSYoshinobu Inoue copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 149882cd038dSYoshinobu Inoue /* XXX: reset mbuf length */ 149982cd038dSYoshinobu Inoue n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 150082cd038dSYoshinobu Inoue sizeof(struct icmp6_nodeinfo) + copied; 150182cd038dSYoshinobu Inoue break; 150282cd038dSYoshinobu Inoue } 150382cd038dSYoshinobu Inoue default: 150482cd038dSYoshinobu Inoue break; /* XXX impossible! */ 150582cd038dSYoshinobu Inoue } 150682cd038dSYoshinobu Inoue 150782cd038dSYoshinobu Inoue nni6->ni_type = ICMP6_NI_REPLY; 1508686cdd19SJun-ichiro itojun Hagino m_freem(m); 150982cd038dSYoshinobu Inoue return (n); 151082cd038dSYoshinobu Inoue 151182cd038dSYoshinobu Inoue bad: 1512686cdd19SJun-ichiro itojun Hagino m_freem(m); 151382cd038dSYoshinobu Inoue if (n) 151482cd038dSYoshinobu Inoue m_freem(n); 151582cd038dSYoshinobu Inoue return (NULL); 151682cd038dSYoshinobu Inoue } 151782cd038dSYoshinobu Inoue 151882cd038dSYoshinobu Inoue /* 1519686cdd19SJun-ichiro itojun Hagino * make a mbuf with DNS-encoded string. no compression support. 1520686cdd19SJun-ichiro itojun Hagino * 1521686cdd19SJun-ichiro itojun Hagino * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1522686cdd19SJun-ichiro itojun Hagino * treated as truncated name (two \0 at the end). this is a wild guess. 15231272577eSXin LI * 15241272577eSXin LI * old - return pascal string if non-zero 1525686cdd19SJun-ichiro itojun Hagino */ 1526686cdd19SJun-ichiro itojun Hagino static struct mbuf * 15271272577eSXin LI ni6_nametodns(const char *name, int namelen, int old) 1528686cdd19SJun-ichiro itojun Hagino { 1529686cdd19SJun-ichiro itojun Hagino struct mbuf *m; 1530686cdd19SJun-ichiro itojun Hagino char *cp, *ep; 1531686cdd19SJun-ichiro itojun Hagino const char *p, *q; 1532686cdd19SJun-ichiro itojun Hagino int i, len, nterm; 1533686cdd19SJun-ichiro itojun Hagino 1534686cdd19SJun-ichiro itojun Hagino if (old) 1535686cdd19SJun-ichiro itojun Hagino len = namelen + 1; 1536686cdd19SJun-ichiro itojun Hagino else 1537686cdd19SJun-ichiro itojun Hagino len = MCLBYTES; 1538686cdd19SJun-ichiro itojun Hagino 15397b07d1beSGleb Smirnoff /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */ 15407b07d1beSGleb Smirnoff if (len > MLEN) 15417b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, 0); 15427b07d1beSGleb Smirnoff else 15437b07d1beSGleb Smirnoff m = m_get(M_NOWAIT, MT_DATA); 15447b07d1beSGleb Smirnoff if (m == NULL) 1545686cdd19SJun-ichiro itojun Hagino goto fail; 1546686cdd19SJun-ichiro itojun Hagino 1547686cdd19SJun-ichiro itojun Hagino if (old) { 1548686cdd19SJun-ichiro itojun Hagino m->m_len = len; 1549686cdd19SJun-ichiro itojun Hagino *mtod(m, char *) = namelen; 1550686cdd19SJun-ichiro itojun Hagino bcopy(name, mtod(m, char *) + 1, namelen); 1551686cdd19SJun-ichiro itojun Hagino return m; 1552686cdd19SJun-ichiro itojun Hagino } else { 1553686cdd19SJun-ichiro itojun Hagino m->m_len = 0; 1554686cdd19SJun-ichiro itojun Hagino cp = mtod(m, char *); 1555686cdd19SJun-ichiro itojun Hagino ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1556686cdd19SJun-ichiro itojun Hagino 1557686cdd19SJun-ichiro itojun Hagino /* if not certain about my name, return empty buffer */ 1558686cdd19SJun-ichiro itojun Hagino if (namelen == 0) 1559686cdd19SJun-ichiro itojun Hagino return m; 1560686cdd19SJun-ichiro itojun Hagino 1561686cdd19SJun-ichiro itojun Hagino /* 1562686cdd19SJun-ichiro itojun Hagino * guess if it looks like shortened hostname, or FQDN. 1563686cdd19SJun-ichiro itojun Hagino * shortened hostname needs two trailing "\0". 1564686cdd19SJun-ichiro itojun Hagino */ 1565686cdd19SJun-ichiro itojun Hagino i = 0; 1566686cdd19SJun-ichiro itojun Hagino for (p = name; p < name + namelen; p++) { 1567686cdd19SJun-ichiro itojun Hagino if (*p && *p == '.') 1568686cdd19SJun-ichiro itojun Hagino i++; 1569686cdd19SJun-ichiro itojun Hagino } 1570686cdd19SJun-ichiro itojun Hagino if (i < 2) 1571686cdd19SJun-ichiro itojun Hagino nterm = 2; 1572686cdd19SJun-ichiro itojun Hagino else 1573686cdd19SJun-ichiro itojun Hagino nterm = 1; 1574686cdd19SJun-ichiro itojun Hagino 1575686cdd19SJun-ichiro itojun Hagino p = name; 1576686cdd19SJun-ichiro itojun Hagino while (cp < ep && p < name + namelen) { 1577686cdd19SJun-ichiro itojun Hagino i = 0; 1578686cdd19SJun-ichiro itojun Hagino for (q = p; q < name + namelen && *q && *q != '.'; q++) 1579686cdd19SJun-ichiro itojun Hagino i++; 1580686cdd19SJun-ichiro itojun Hagino /* result does not fit into mbuf */ 1581686cdd19SJun-ichiro itojun Hagino if (cp + i + 1 >= ep) 1582686cdd19SJun-ichiro itojun Hagino goto fail; 1583610be6ceSHajimu UMEMOTO /* 1584610be6ceSHajimu UMEMOTO * DNS label length restriction, RFC1035 page 8. 1585610be6ceSHajimu UMEMOTO * "i == 0" case is included here to avoid returning 1586610be6ceSHajimu UMEMOTO * 0-length label on "foo..bar". 1587610be6ceSHajimu UMEMOTO */ 1588610be6ceSHajimu UMEMOTO if (i <= 0 || i >= 64) 1589686cdd19SJun-ichiro itojun Hagino goto fail; 1590686cdd19SJun-ichiro itojun Hagino *cp++ = i; 1591686cdd19SJun-ichiro itojun Hagino bcopy(p, cp, i); 1592686cdd19SJun-ichiro itojun Hagino cp += i; 1593686cdd19SJun-ichiro itojun Hagino p = q; 1594686cdd19SJun-ichiro itojun Hagino if (p < name + namelen && *p == '.') 1595686cdd19SJun-ichiro itojun Hagino p++; 1596686cdd19SJun-ichiro itojun Hagino } 1597686cdd19SJun-ichiro itojun Hagino /* termination */ 1598686cdd19SJun-ichiro itojun Hagino if (cp + nterm >= ep) 1599686cdd19SJun-ichiro itojun Hagino goto fail; 1600686cdd19SJun-ichiro itojun Hagino while (nterm-- > 0) 1601686cdd19SJun-ichiro itojun Hagino *cp++ = '\0'; 1602686cdd19SJun-ichiro itojun Hagino m->m_len = cp - mtod(m, char *); 1603686cdd19SJun-ichiro itojun Hagino return m; 1604686cdd19SJun-ichiro itojun Hagino } 1605686cdd19SJun-ichiro itojun Hagino 1606686cdd19SJun-ichiro itojun Hagino panic("should not reach here"); 1607686cdd19SJun-ichiro itojun Hagino /* NOTREACHED */ 1608686cdd19SJun-ichiro itojun Hagino 1609686cdd19SJun-ichiro itojun Hagino fail: 1610686cdd19SJun-ichiro itojun Hagino if (m) 1611686cdd19SJun-ichiro itojun Hagino m_freem(m); 1612686cdd19SJun-ichiro itojun Hagino return NULL; 1613686cdd19SJun-ichiro itojun Hagino } 1614686cdd19SJun-ichiro itojun Hagino 1615686cdd19SJun-ichiro itojun Hagino /* 1616686cdd19SJun-ichiro itojun Hagino * check if two DNS-encoded string matches. takes care of truncated 1617686cdd19SJun-ichiro itojun Hagino * form (with \0\0 at the end). no compression support. 161833841545SHajimu UMEMOTO * XXX upper/lowercase match (see RFC2065) 1619686cdd19SJun-ichiro itojun Hagino */ 1620686cdd19SJun-ichiro itojun Hagino static int 16211272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1622686cdd19SJun-ichiro itojun Hagino { 1623686cdd19SJun-ichiro itojun Hagino const char *a0, *b0; 1624686cdd19SJun-ichiro itojun Hagino int l; 1625686cdd19SJun-ichiro itojun Hagino 1626686cdd19SJun-ichiro itojun Hagino /* simplest case - need validation? */ 1627686cdd19SJun-ichiro itojun Hagino if (alen == blen && bcmp(a, b, alen) == 0) 1628686cdd19SJun-ichiro itojun Hagino return 1; 1629686cdd19SJun-ichiro itojun Hagino 1630686cdd19SJun-ichiro itojun Hagino a0 = a; 1631686cdd19SJun-ichiro itojun Hagino b0 = b; 1632686cdd19SJun-ichiro itojun Hagino 1633686cdd19SJun-ichiro itojun Hagino /* termination is mandatory */ 1634686cdd19SJun-ichiro itojun Hagino if (alen < 2 || blen < 2) 1635686cdd19SJun-ichiro itojun Hagino return 0; 1636686cdd19SJun-ichiro itojun Hagino if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1637686cdd19SJun-ichiro itojun Hagino return 0; 1638686cdd19SJun-ichiro itojun Hagino alen--; 1639686cdd19SJun-ichiro itojun Hagino blen--; 1640686cdd19SJun-ichiro itojun Hagino 1641686cdd19SJun-ichiro itojun Hagino while (a - a0 < alen && b - b0 < blen) { 1642686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1643686cdd19SJun-ichiro itojun Hagino return 0; 1644686cdd19SJun-ichiro itojun Hagino 1645686cdd19SJun-ichiro itojun Hagino if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1646686cdd19SJun-ichiro itojun Hagino return 0; 1647686cdd19SJun-ichiro itojun Hagino /* we don't support compression yet */ 1648686cdd19SJun-ichiro itojun Hagino if (a[0] >= 64 || b[0] >= 64) 1649686cdd19SJun-ichiro itojun Hagino return 0; 1650686cdd19SJun-ichiro itojun Hagino 1651686cdd19SJun-ichiro itojun Hagino /* truncated case */ 1652686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 && a - a0 == alen - 1) 1653686cdd19SJun-ichiro itojun Hagino return 1; 1654686cdd19SJun-ichiro itojun Hagino if (b[0] == 0 && b - b0 == blen - 1) 1655686cdd19SJun-ichiro itojun Hagino return 1; 1656686cdd19SJun-ichiro itojun Hagino if (a[0] == 0 || b[0] == 0) 1657686cdd19SJun-ichiro itojun Hagino return 0; 1658686cdd19SJun-ichiro itojun Hagino 1659686cdd19SJun-ichiro itojun Hagino if (a[0] != b[0]) 1660686cdd19SJun-ichiro itojun Hagino return 0; 1661686cdd19SJun-ichiro itojun Hagino l = a[0]; 1662686cdd19SJun-ichiro itojun Hagino if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1663686cdd19SJun-ichiro itojun Hagino return 0; 1664686cdd19SJun-ichiro itojun Hagino if (bcmp(a + 1, b + 1, l) != 0) 1665686cdd19SJun-ichiro itojun Hagino return 0; 1666686cdd19SJun-ichiro itojun Hagino 1667686cdd19SJun-ichiro itojun Hagino a += 1 + l; 1668686cdd19SJun-ichiro itojun Hagino b += 1 + l; 1669686cdd19SJun-ichiro itojun Hagino } 1670686cdd19SJun-ichiro itojun Hagino 1671686cdd19SJun-ichiro itojun Hagino if (a - a0 == alen && b - b0 == blen) 1672686cdd19SJun-ichiro itojun Hagino return 1; 1673686cdd19SJun-ichiro itojun Hagino else 1674686cdd19SJun-ichiro itojun Hagino return 0; 1675686cdd19SJun-ichiro itojun Hagino } 1676686cdd19SJun-ichiro itojun Hagino 1677686cdd19SJun-ichiro itojun Hagino /* 167882cd038dSYoshinobu Inoue * calculate the number of addresses to be returned in the node info reply. 167982cd038dSYoshinobu Inoue */ 168082cd038dSYoshinobu Inoue static int 16811272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 16821272577eSXin LI struct in6_addr *subj) 168382cd038dSYoshinobu Inoue { 168433841545SHajimu UMEMOTO struct ifnet *ifp; 168533841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 168633841545SHajimu UMEMOTO struct ifaddr *ifa; 168782cd038dSYoshinobu Inoue int addrs = 0, addrsofif, iffound = 0; 168833841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 168933841545SHajimu UMEMOTO 1690b8a6e03fSGleb Smirnoff NET_EPOCH_ASSERT(); 1691b8a6e03fSGleb Smirnoff 169233841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 169333841545SHajimu UMEMOTO switch (ni6->ni_code) { 169433841545SHajimu UMEMOTO case ICMP6_NI_SUBJ_IPV6: 169533841545SHajimu UMEMOTO if (subj == NULL) /* must be impossible... */ 169633841545SHajimu UMEMOTO return (0); 169733841545SHajimu UMEMOTO break; 169833841545SHajimu UMEMOTO default: 169933841545SHajimu UMEMOTO /* 170033841545SHajimu UMEMOTO * XXX: we only support IPv6 subject address for 170133841545SHajimu UMEMOTO * this Qtype. 170233841545SHajimu UMEMOTO */ 170333841545SHajimu UMEMOTO return (0); 170433841545SHajimu UMEMOTO } 170533841545SHajimu UMEMOTO } 170682cd038dSYoshinobu Inoue 17074f6c66ccSMatt Macy CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 170882cd038dSYoshinobu Inoue addrsofif = 0; 1709d7c5a620SMatt Macy CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 171082cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 171182cd038dSYoshinobu Inoue continue; 171282cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 171382cd038dSYoshinobu Inoue 171433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1715c66b5feaSHajimu UMEMOTO IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr)) 171682cd038dSYoshinobu Inoue iffound = 1; 171782cd038dSYoshinobu Inoue 1718686cdd19SJun-ichiro itojun Hagino /* 1719686cdd19SJun-ichiro itojun Hagino * IPv4-mapped addresses can only be returned by a 1720686cdd19SJun-ichiro itojun Hagino * Node Information proxy, since they represent 1721686cdd19SJun-ichiro itojun Hagino * addresses of IPv4-only nodes, which perforce do 1722686cdd19SJun-ichiro itojun Hagino * not implement this protocol. 172333841545SHajimu UMEMOTO * [icmp-name-lookups-07, Section 5.4] 1724686cdd19SJun-ichiro itojun Hagino * So we don't support NI_NODEADDR_FLAG_COMPAT in 1725686cdd19SJun-ichiro itojun Hagino * this function at this moment. 1726686cdd19SJun-ichiro itojun Hagino */ 1727686cdd19SJun-ichiro itojun Hagino 172882cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 172982cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 173082cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 173133841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 173233841545SHajimu UMEMOTO continue; 173382cd038dSYoshinobu Inoue break; 173482cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 173533841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 173633841545SHajimu UMEMOTO continue; 173782cd038dSYoshinobu Inoue break; 173882cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 173933841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 174033841545SHajimu UMEMOTO continue; 174182cd038dSYoshinobu Inoue break; 174282cd038dSYoshinobu Inoue default: 174382cd038dSYoshinobu Inoue continue; 174482cd038dSYoshinobu Inoue } 174533841545SHajimu UMEMOTO 174633841545SHajimu UMEMOTO /* 174733841545SHajimu UMEMOTO * check if anycast is okay. 174833841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 174933841545SHajimu UMEMOTO */ 175033841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 175133841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 175233841545SHajimu UMEMOTO continue; /* we need only unicast addresses */ 175333841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1754603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 175533841545SHajimu UMEMOTO continue; 175633841545SHajimu UMEMOTO } 175733841545SHajimu UMEMOTO addrsofif++; /* count the address */ 175882cd038dSYoshinobu Inoue } 175982cd038dSYoshinobu Inoue if (iffound) { 176082cd038dSYoshinobu Inoue *ifpp = ifp; 176182cd038dSYoshinobu Inoue return (addrsofif); 176282cd038dSYoshinobu Inoue } 176382cd038dSYoshinobu Inoue 176482cd038dSYoshinobu Inoue addrs += addrsofif; 176582cd038dSYoshinobu Inoue } 176682cd038dSYoshinobu Inoue 176782cd038dSYoshinobu Inoue return (addrs); 176882cd038dSYoshinobu Inoue } 176982cd038dSYoshinobu Inoue 177082cd038dSYoshinobu Inoue static int 17711272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 17721272577eSXin LI struct ifnet *ifp0, int resid) 177382cd038dSYoshinobu Inoue { 177494e83133SJohn Baldwin struct ifnet *ifp; 177533841545SHajimu UMEMOTO struct in6_ifaddr *ifa6; 177633841545SHajimu UMEMOTO struct ifaddr *ifa; 177733841545SHajimu UMEMOTO struct ifnet *ifp_dep = NULL; 177833841545SHajimu UMEMOTO int copied = 0, allow_deprecated = 0; 177982cd038dSYoshinobu Inoue u_char *cp = (u_char *)(nni6 + 1); 178033841545SHajimu UMEMOTO int niflags = ni6->ni_flags; 178133841545SHajimu UMEMOTO u_int32_t ltime; 178282cd038dSYoshinobu Inoue 1783b8a6e03fSGleb Smirnoff NET_EPOCH_ASSERT(); 1784b8a6e03fSGleb Smirnoff 178533841545SHajimu UMEMOTO if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 178682cd038dSYoshinobu Inoue return (0); /* needless to copy */ 178782cd038dSYoshinobu Inoue 17884f6c66ccSMatt Macy ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet); 178933841545SHajimu UMEMOTO again: 17900527d333SHajimu UMEMOTO 17914f6c66ccSMatt Macy for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) { 1792d7c5a620SMatt Macy CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 179382cd038dSYoshinobu Inoue if (ifa->ifa_addr->sa_family != AF_INET6) 179482cd038dSYoshinobu Inoue continue; 179582cd038dSYoshinobu Inoue ifa6 = (struct in6_ifaddr *)ifa; 179682cd038dSYoshinobu Inoue 179733841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 179833841545SHajimu UMEMOTO allow_deprecated == 0) { 179933841545SHajimu UMEMOTO /* 180033841545SHajimu UMEMOTO * prefererred address should be put before 180133841545SHajimu UMEMOTO * deprecated addresses. 180233841545SHajimu UMEMOTO */ 180333841545SHajimu UMEMOTO 180433841545SHajimu UMEMOTO /* record the interface for later search */ 180533841545SHajimu UMEMOTO if (ifp_dep == NULL) 180633841545SHajimu UMEMOTO ifp_dep = ifp; 180733841545SHajimu UMEMOTO 180882cd038dSYoshinobu Inoue continue; 180906cd0a3fSHajimu UMEMOTO } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 181033841545SHajimu UMEMOTO allow_deprecated != 0) 181133841545SHajimu UMEMOTO continue; /* we now collect deprecated addrs */ 181282cd038dSYoshinobu Inoue 181382cd038dSYoshinobu Inoue /* What do we have to do about ::1? */ 181482cd038dSYoshinobu Inoue switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 181582cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_LINKLOCAL: 181633841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 181733841545SHajimu UMEMOTO continue; 181882cd038dSYoshinobu Inoue break; 181982cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_SITELOCAL: 182033841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 182133841545SHajimu UMEMOTO continue; 182282cd038dSYoshinobu Inoue break; 182382cd038dSYoshinobu Inoue case IPV6_ADDR_SCOPE_GLOBAL: 182433841545SHajimu UMEMOTO if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 182533841545SHajimu UMEMOTO continue; 182682cd038dSYoshinobu Inoue break; 182782cd038dSYoshinobu Inoue default: 182882cd038dSYoshinobu Inoue continue; 182982cd038dSYoshinobu Inoue } 183082cd038dSYoshinobu Inoue 183133841545SHajimu UMEMOTO /* 183233841545SHajimu UMEMOTO * check if anycast is okay. 183333841545SHajimu UMEMOTO * XXX: just experimental. not in the spec. 183433841545SHajimu UMEMOTO */ 183533841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 183633841545SHajimu UMEMOTO (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 183733841545SHajimu UMEMOTO continue; 183833841545SHajimu UMEMOTO if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1839603724d3SBjoern A. Zeeb (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 184033841545SHajimu UMEMOTO continue; 184133841545SHajimu UMEMOTO } 184233841545SHajimu UMEMOTO 184333841545SHajimu UMEMOTO /* now we can copy the address */ 184433841545SHajimu UMEMOTO if (resid < sizeof(struct in6_addr) + 184533841545SHajimu UMEMOTO sizeof(u_int32_t)) { 184682cd038dSYoshinobu Inoue /* 184782cd038dSYoshinobu Inoue * We give up much more copy. 184882cd038dSYoshinobu Inoue * Set the truncate flag and return. 184982cd038dSYoshinobu Inoue */ 185006cd0a3fSHajimu UMEMOTO nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 185182cd038dSYoshinobu Inoue return (copied); 185282cd038dSYoshinobu Inoue } 185333841545SHajimu UMEMOTO 185433841545SHajimu UMEMOTO /* 185533841545SHajimu UMEMOTO * Set the TTL of the address. 185633841545SHajimu UMEMOTO * The TTL value should be one of the following 185733841545SHajimu UMEMOTO * according to the specification: 185833841545SHajimu UMEMOTO * 185933841545SHajimu UMEMOTO * 1. The remaining lifetime of a DHCP lease on the 186033841545SHajimu UMEMOTO * address, or 186133841545SHajimu UMEMOTO * 2. The remaining Valid Lifetime of a prefix from 186233841545SHajimu UMEMOTO * which the address was derived through Stateless 186333841545SHajimu UMEMOTO * Autoconfiguration. 186433841545SHajimu UMEMOTO * 186533841545SHajimu UMEMOTO * Note that we currently do not support stateful 186633841545SHajimu UMEMOTO * address configuration by DHCPv6, so the former 186733841545SHajimu UMEMOTO * case can't happen. 186833841545SHajimu UMEMOTO */ 186933841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire == 0) 187033841545SHajimu UMEMOTO ltime = ND6_INFINITE_LIFETIME; 187133841545SHajimu UMEMOTO else { 187233841545SHajimu UMEMOTO if (ifa6->ia6_lifetime.ia6t_expire > 18737d26db17SHiroki Sato time_uptime) 18747d26db17SHiroki Sato ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 187533841545SHajimu UMEMOTO else 187633841545SHajimu UMEMOTO ltime = 0; 187733841545SHajimu UMEMOTO } 187833841545SHajimu UMEMOTO 187933841545SHajimu UMEMOTO bcopy(<ime, cp, sizeof(u_int32_t)); 188033841545SHajimu UMEMOTO cp += sizeof(u_int32_t); 188133841545SHajimu UMEMOTO 188233841545SHajimu UMEMOTO /* copy the address itself */ 188382cd038dSYoshinobu Inoue bcopy(&ifa6->ia_addr.sin6_addr, cp, 188482cd038dSYoshinobu Inoue sizeof(struct in6_addr)); 18859a4f9608SHajimu UMEMOTO in6_clearscope((struct in6_addr *)cp); /* XXX */ 188682cd038dSYoshinobu Inoue cp += sizeof(struct in6_addr); 188733841545SHajimu UMEMOTO 188833841545SHajimu UMEMOTO resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 188906cd0a3fSHajimu UMEMOTO copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 189082cd038dSYoshinobu Inoue } 189182cd038dSYoshinobu Inoue if (ifp0) /* we need search only on the specified IF */ 189282cd038dSYoshinobu Inoue break; 189382cd038dSYoshinobu Inoue } 189482cd038dSYoshinobu Inoue 189533841545SHajimu UMEMOTO if (allow_deprecated == 0 && ifp_dep != NULL) { 189633841545SHajimu UMEMOTO ifp = ifp_dep; 189733841545SHajimu UMEMOTO allow_deprecated = 1; 189833841545SHajimu UMEMOTO 189933841545SHajimu UMEMOTO goto again; 190033841545SHajimu UMEMOTO } 190133841545SHajimu UMEMOTO 190282cd038dSYoshinobu Inoue return (copied); 190382cd038dSYoshinobu Inoue } 190482cd038dSYoshinobu Inoue 1905db0ac6deSCy Schubert static bool 1906db0ac6deSCy Schubert icmp6_rip6_match(const struct inpcb *inp, void *v) 1907db0ac6deSCy Schubert { 1908db0ac6deSCy Schubert struct ip6_hdr *ip6 = v; 1909db0ac6deSCy Schubert 1910db0ac6deSCy Schubert if ((inp->inp_vflag & INP_IPV6) == 0) 1911db0ac6deSCy Schubert return (false); 1912db0ac6deSCy Schubert if (inp->inp_ip_p != IPPROTO_ICMPV6) 1913db0ac6deSCy Schubert return (false); 1914db0ac6deSCy Schubert if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && 1915db0ac6deSCy Schubert !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst)) 1916db0ac6deSCy Schubert return (false); 1917db0ac6deSCy Schubert if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1918db0ac6deSCy Schubert !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src)) 1919db0ac6deSCy Schubert return (false); 1920db0ac6deSCy Schubert return (true); 1921db0ac6deSCy Schubert } 1922db0ac6deSCy Schubert 192382cd038dSYoshinobu Inoue /* 192482cd038dSYoshinobu Inoue * XXX almost dup'ed code with rip6_input. 192582cd038dSYoshinobu Inoue */ 192682cd038dSYoshinobu Inoue static int 19271272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off) 192882cd038dSYoshinobu Inoue { 1929db0ac6deSCy Schubert struct mbuf *n, *m = *mp; 193033841545SHajimu UMEMOTO struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1931db0ac6deSCy Schubert struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo, 1932db0ac6deSCy Schubert INPLOOKUP_RLOCKPCB, icmp6_rip6_match, ip6); 19330ecd976eSBjoern A. Zeeb struct inpcb *inp; 19349a4f9608SHajimu UMEMOTO struct sockaddr_in6 fromsa; 193582cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 193682cd038dSYoshinobu Inoue struct mbuf *opts = NULL; 1937db0ac6deSCy Schubert int delivered = 0; 1938cf377af6SGleb Smirnoff 1939a61b5cfbSBjoern A. Zeeb /* This is assumed to be safe; icmp6_input() does a pullup. */ 194082cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 194182cd038dSYoshinobu Inoue 1942a1f7e5f8SHajimu UMEMOTO /* 1943a1f7e5f8SHajimu UMEMOTO * XXX: the address may have embedded scope zone ID, which should be 1944a1f7e5f8SHajimu UMEMOTO * hidden from applications. 1945a1f7e5f8SHajimu UMEMOTO */ 19469a4f9608SHajimu UMEMOTO bzero(&fromsa, sizeof(fromsa)); 19479a4f9608SHajimu UMEMOTO fromsa.sin6_family = AF_INET6; 1948a1f7e5f8SHajimu UMEMOTO fromsa.sin6_len = sizeof(struct sockaddr_in6); 1949a1f7e5f8SHajimu UMEMOTO fromsa.sin6_addr = ip6->ip6_src; 1950a1f7e5f8SHajimu UMEMOTO if (sa6_recoverscope(&fromsa)) { 1951a1f7e5f8SHajimu UMEMOTO m_freem(m); 1952a8fe77d8SBjoern A. Zeeb *mp = NULL; 1953a1f7e5f8SHajimu UMEMOTO return (IPPROTO_DONE); 1954a1f7e5f8SHajimu UMEMOTO } 195582cd038dSYoshinobu Inoue 1956db0ac6deSCy Schubert while ((inp = inp_next(&inpi)) != NULL) { 1957266f97b5SCy Schubert if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1958db0ac6deSCy Schubert inp->in6p_icmp6filt)) 1959266f97b5SCy Schubert continue; 1960657db3c8SHajimu UMEMOTO /* 1961657db3c8SHajimu UMEMOTO * Recent network drivers tend to allocate a single 1962657db3c8SHajimu UMEMOTO * mbuf cluster, rather than to make a couple of 1963657db3c8SHajimu UMEMOTO * mbufs without clusters. Also, since the IPv6 code 1964657db3c8SHajimu UMEMOTO * path tries to avoid m_pullup(), it is highly 1965657db3c8SHajimu UMEMOTO * probable that we still have an mbuf cluster here 1966657db3c8SHajimu UMEMOTO * even though the necessary length can be stored in an 1967657db3c8SHajimu UMEMOTO * mbuf's internal buffer. 1968657db3c8SHajimu UMEMOTO * Meanwhile, the default size of the receive socket 1969657db3c8SHajimu UMEMOTO * buffer for raw sockets is not so large. This means 1970657db3c8SHajimu UMEMOTO * the possibility of packet loss is relatively higher 1971657db3c8SHajimu UMEMOTO * than before. To avoid this scenario, we copy the 1972657db3c8SHajimu UMEMOTO * received data to a separate mbuf that does not use 1973657db3c8SHajimu UMEMOTO * a cluster, if possible. 1974657db3c8SHajimu UMEMOTO * XXX: it is better to copy the data after stripping 1975657db3c8SHajimu UMEMOTO * intermediate headers. 1976657db3c8SHajimu UMEMOTO */ 1977657db3c8SHajimu UMEMOTO if ((m->m_flags & M_EXT) && m->m_next == NULL && 1978657db3c8SHajimu UMEMOTO m->m_len <= MHLEN) { 19797b07d1beSGleb Smirnoff n = m_get(M_NOWAIT, m->m_type); 1980657db3c8SHajimu UMEMOTO if (n != NULL) { 1981c543ec4eSGeorge V. Neville-Neil if (m_dup_pkthdr(n, m, M_NOWAIT)) { 1982db0ac6deSCy Schubert bcopy(m->m_data, n->m_data, m->m_len); 1983657db3c8SHajimu UMEMOTO n->m_len = m->m_len; 1984c543ec4eSGeorge V. Neville-Neil } else { 1985c543ec4eSGeorge V. Neville-Neil m_free(n); 1986c543ec4eSGeorge V. Neville-Neil n = NULL; 1987c543ec4eSGeorge V. Neville-Neil } 1988657db3c8SHajimu UMEMOTO } 1989db0ac6deSCy Schubert } else 1990db0ac6deSCy Schubert n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1991db0ac6deSCy Schubert if (n == NULL) 1992db0ac6deSCy Schubert continue; 1993db0ac6deSCy Schubert if (inp->inp_flags & INP_CONTROLOPTS) 1994db0ac6deSCy Schubert ip6_savecontrol(inp, n, &opts); 199582cd038dSYoshinobu Inoue /* strip intermediate headers */ 199682cd038dSYoshinobu Inoue m_adj(n, off); 1997db0ac6deSCy Schubert SOCKBUF_LOCK(&inp->inp_socket->so_rcv); 1998db0ac6deSCy Schubert if (sbappendaddr_locked(&inp->inp_socket->so_rcv, 1999db0ac6deSCy Schubert (struct sockaddr *)&fromsa, n, opts) == 0) { 2000db0ac6deSCy Schubert soroverflow_locked(inp->inp_socket); 200182cd038dSYoshinobu Inoue m_freem(n); 2002266f97b5SCy Schubert if (opts) 2003266f97b5SCy Schubert m_freem(opts); 2004266f97b5SCy Schubert } else { 2005db0ac6deSCy Schubert sorwakeup_locked(inp->inp_socket); 2006db0ac6deSCy Schubert delivered++; 2007266f97b5SCy Schubert } 2008db0ac6deSCy Schubert opts = NULL; 2009db0ac6deSCy Schubert } 2010db0ac6deSCy Schubert m_freem(m); 2011266f97b5SCy Schubert *mp = NULL; 2012db0ac6deSCy Schubert if (delivered == 0) 2013db0ac6deSCy Schubert IP6STAT_DEC(ip6s_delivered); 2014a8fe77d8SBjoern A. Zeeb return (IPPROTO_DONE); 201582cd038dSYoshinobu Inoue } 201682cd038dSYoshinobu Inoue 201782cd038dSYoshinobu Inoue /* 201882cd038dSYoshinobu Inoue * Reflect the ip6 packet back to the source. 2019686cdd19SJun-ichiro itojun Hagino * OFF points to the icmp6 header, counted from the top of the mbuf. 202082cd038dSYoshinobu Inoue */ 20210700d2c3SBjoern A. Zeeb static void 20221272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off) 202382cd038dSYoshinobu Inoue { 2024ab861e6cSAlexander V. Chernikov struct in6_addr src6, *srcp; 2025686cdd19SJun-ichiro itojun Hagino struct ip6_hdr *ip6; 202682cd038dSYoshinobu Inoue struct icmp6_hdr *icmp6; 20278c0fec80SRobert Watson struct in6_ifaddr *ia = NULL; 20283e88eb90SAndrey V. Elsukov struct ifnet *outif = NULL; 2029686cdd19SJun-ichiro itojun Hagino int plen; 2030ab861e6cSAlexander V. Chernikov int type, code, hlim; 203182cd038dSYoshinobu Inoue 2032686cdd19SJun-ichiro itojun Hagino /* too short to reflect */ 2033686cdd19SJun-ichiro itojun Hagino if (off < sizeof(struct ip6_hdr)) { 203433841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 203533841545SHajimu UMEMOTO "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2036686cdd19SJun-ichiro itojun Hagino (u_long)off, (u_long)sizeof(struct ip6_hdr), 203733841545SHajimu UMEMOTO __FILE__, __LINE__)); 2038686cdd19SJun-ichiro itojun Hagino goto bad; 2039686cdd19SJun-ichiro itojun Hagino } 2040686cdd19SJun-ichiro itojun Hagino 204182cd038dSYoshinobu Inoue /* 204282cd038dSYoshinobu Inoue * If there are extra headers between IPv6 and ICMPv6, strip 204382cd038dSYoshinobu Inoue * off that header first. 204482cd038dSYoshinobu Inoue */ 2045686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC 2046686cdd19SJun-ichiro itojun Hagino if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2047686cdd19SJun-ichiro itojun Hagino panic("assumption failed in icmp6_reflect"); 2048686cdd19SJun-ichiro itojun Hagino #endif 2049686cdd19SJun-ichiro itojun Hagino if (off > sizeof(struct ip6_hdr)) { 2050686cdd19SJun-ichiro itojun Hagino size_t l; 2051686cdd19SJun-ichiro itojun Hagino struct ip6_hdr nip6; 205282cd038dSYoshinobu Inoue 2053686cdd19SJun-ichiro itojun Hagino l = off - sizeof(struct ip6_hdr); 2054686cdd19SJun-ichiro itojun Hagino m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2055686cdd19SJun-ichiro itojun Hagino m_adj(m, l); 2056686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2057686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2058686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2059686cdd19SJun-ichiro itojun Hagino return; 206082cd038dSYoshinobu Inoue } 2061686cdd19SJun-ichiro itojun Hagino bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2062686cdd19SJun-ichiro itojun Hagino } else /* off == sizeof(struct ip6_hdr) */ { 2063686cdd19SJun-ichiro itojun Hagino size_t l; 2064686cdd19SJun-ichiro itojun Hagino l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2065686cdd19SJun-ichiro itojun Hagino if (m->m_len < l) { 2066686cdd19SJun-ichiro itojun Hagino if ((m = m_pullup(m, l)) == NULL) 2067686cdd19SJun-ichiro itojun Hagino return; 206882cd038dSYoshinobu Inoue } 2069686cdd19SJun-ichiro itojun Hagino } 2070686cdd19SJun-ichiro itojun Hagino plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 207182cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 207282cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 207382cd038dSYoshinobu Inoue icmp6 = (struct icmp6_hdr *)(ip6 + 1); 207482cd038dSYoshinobu Inoue type = icmp6->icmp6_type; /* keep type for statistics */ 207582cd038dSYoshinobu Inoue code = icmp6->icmp6_code; /* ditto. */ 2076ab861e6cSAlexander V. Chernikov hlim = 0; 2077ab861e6cSAlexander V. Chernikov srcp = NULL; 207882cd038dSYoshinobu Inoue 207982cd038dSYoshinobu Inoue /* 208082cd038dSYoshinobu Inoue * If the incoming packet was addressed directly to us (i.e. unicast), 208182cd038dSYoshinobu Inoue * use dst as the src for the reply. 208206cd0a3fSHajimu UMEMOTO * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2083686cdd19SJun-ichiro itojun Hagino * (for example) when we encounter an error while forwarding procedure 2084686cdd19SJun-ichiro itojun Hagino * destined to a duplicated address of ours. 208582cd038dSYoshinobu Inoue */ 20863e88eb90SAndrey V. Elsukov if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 20878268d82cSAlexander V. Chernikov ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 20883e88eb90SAndrey V. Elsukov if (ia != NULL && !(ia->ia6_flags & 2089ab861e6cSAlexander V. Chernikov (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2090ab861e6cSAlexander V. Chernikov src6 = ia->ia_addr.sin6_addr; 2091ab861e6cSAlexander V. Chernikov srcp = &src6; 2092ab861e6cSAlexander V. Chernikov 2093ab861e6cSAlexander V. Chernikov if (m->m_pkthdr.rcvif != NULL) { 2094ab861e6cSAlexander V. Chernikov /* XXX: This may not be the outgoing interface */ 2095ab861e6cSAlexander V. Chernikov hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2096ab861e6cSAlexander V. Chernikov } else 2097ab861e6cSAlexander V. Chernikov hlim = V_ip6_defhlim; 2098ab861e6cSAlexander V. Chernikov } 209982cd038dSYoshinobu Inoue } 210082cd038dSYoshinobu Inoue 210188d166bfSBjoern A. Zeeb if (srcp == NULL) { 2102601c0b8bSAlexander V. Chernikov int error; 2103601c0b8bSAlexander V. Chernikov struct in6_addr dst6; 2104601c0b8bSAlexander V. Chernikov uint32_t scopeid; 210533841545SHajimu UMEMOTO 210682cd038dSYoshinobu Inoue /* 2107686cdd19SJun-ichiro itojun Hagino * This case matches to multicasts, our anycast, or unicasts 210833841545SHajimu UMEMOTO * that we do not own. Select a source address based on the 210933841545SHajimu UMEMOTO * source address of the erroneous packet. 211082cd038dSYoshinobu Inoue */ 21115a03e781SAndrey V. Elsukov in6_splitscope(&ip6->ip6_src, &dst6, &scopeid); 2112559b4296SAlan Somers error = in6_selectsrc_addr(M_GETFIB(m), &dst6, 2113601c0b8bSAlexander V. Chernikov scopeid, NULL, &src6, &hlim); 2114a1f7e5f8SHajimu UMEMOTO 2115601c0b8bSAlexander V. Chernikov if (error) { 21161d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 211733841545SHajimu UMEMOTO nd6log((LOG_DEBUG, 211833841545SHajimu UMEMOTO "icmp6_reflect: source can't be determined: " 211933841545SHajimu UMEMOTO "dst=%s, error=%d\n", 2120601c0b8bSAlexander V. Chernikov ip6_sprintf(ip6buf, &ip6->ip6_dst), error)); 212182cd038dSYoshinobu Inoue goto bad; 212233841545SHajimu UMEMOTO } 2123ab861e6cSAlexander V. Chernikov srcp = &src6; 212433841545SHajimu UMEMOTO } 21253e88eb90SAndrey V. Elsukov /* 21263e88eb90SAndrey V. Elsukov * ip6_input() drops a packet if its src is multicast. 21273e88eb90SAndrey V. Elsukov * So, the src is never multicast. 21283e88eb90SAndrey V. Elsukov */ 21293e88eb90SAndrey V. Elsukov ip6->ip6_dst = ip6->ip6_src; 213088d166bfSBjoern A. Zeeb ip6->ip6_src = *srcp; 213182cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2132686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2133686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 213482cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 2135ab861e6cSAlexander V. Chernikov ip6->ip6_hlim = hlim; 213682cd038dSYoshinobu Inoue 213782cd038dSYoshinobu Inoue icmp6->icmp6_cksum = 0; 213882cd038dSYoshinobu Inoue icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 213982cd038dSYoshinobu Inoue sizeof(struct ip6_hdr), plen); 214082cd038dSYoshinobu Inoue 214182cd038dSYoshinobu Inoue /* 214233841545SHajimu UMEMOTO * XXX option handling 214382cd038dSYoshinobu Inoue */ 214482cd038dSYoshinobu Inoue 214582cd038dSYoshinobu Inoue m->m_flags &= ~(M_BCAST|M_MCAST); 2146849eeaa5SAndrey V. Elsukov m->m_pkthdr.rcvif = NULL; 21475d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 214882cd038dSYoshinobu Inoue if (outif) 214982cd038dSYoshinobu Inoue icmp6_ifoutstat_inc(outif, type, code); 215082cd038dSYoshinobu Inoue 215182cd038dSYoshinobu Inoue return; 215282cd038dSYoshinobu Inoue 215382cd038dSYoshinobu Inoue bad: 215482cd038dSYoshinobu Inoue m_freem(m); 215582cd038dSYoshinobu Inoue return; 215682cd038dSYoshinobu Inoue } 215782cd038dSYoshinobu Inoue 215882cd038dSYoshinobu Inoue static const char * 21591272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 21601272577eSXin LI struct in6_addr *tgt6) 216182cd038dSYoshinobu Inoue { 216282cd038dSYoshinobu Inoue static char buf[1024]; 21631d54aa3bSBjoern A. Zeeb char ip6bufs[INET6_ADDRSTRLEN]; 21641d54aa3bSBjoern A. Zeeb char ip6bufd[INET6_ADDRSTRLEN]; 21651d54aa3bSBjoern A. Zeeb char ip6buft[INET6_ADDRSTRLEN]; 216682cd038dSYoshinobu Inoue snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 21671d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6), 21681d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buft, tgt6)); 216982cd038dSYoshinobu Inoue return buf; 217082cd038dSYoshinobu Inoue } 217182cd038dSYoshinobu Inoue 217282cd038dSYoshinobu Inoue void 21731272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off) 217482cd038dSYoshinobu Inoue { 21752cb64cb2SGeorge V. Neville-Neil struct ifnet *ifp; 2176503f4e47SBjoern A. Zeeb struct ip6_hdr *ip6; 2177686cdd19SJun-ichiro itojun Hagino struct nd_redirect *nd_rd; 2178a61b5cfbSBjoern A. Zeeb struct in6_addr src6, redtgt6, reddst6; 217982cd038dSYoshinobu Inoue union nd_opts ndopts; 21801d54aa3bSBjoern A. Zeeb char ip6buf[INET6_ADDRSTRLEN]; 2181503f4e47SBjoern A. Zeeb char *lladdr; 2182503f4e47SBjoern A. Zeeb int icmp6len, is_onlink, is_router, lladdrlen; 218382cd038dSYoshinobu Inoue 218437c1ff48SGleb Smirnoff M_ASSERTPKTHDR(m); 218537c1ff48SGleb Smirnoff KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__)); 21862cb64cb2SGeorge V. Neville-Neil 218782cd038dSYoshinobu Inoue /* XXX if we are router, we don't update route by icmp6 redirect */ 2188603724d3SBjoern A. Zeeb if (V_ip6_forwarding) 2189686cdd19SJun-ichiro itojun Hagino goto freeit; 2190603724d3SBjoern A. Zeeb if (!V_icmp6_rediraccept) 2191686cdd19SJun-ichiro itojun Hagino goto freeit; 2192686cdd19SJun-ichiro itojun Hagino 2193a4061289SAndrey V. Elsukov /* RFC 6980: Nodes MUST silently ignore fragments */ 2194a4061289SAndrey V. Elsukov if(m->m_flags & M_FRAGMENTED) 2195a4061289SAndrey V. Elsukov goto freeit; 2196a4061289SAndrey V. Elsukov 2197503f4e47SBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 2198503f4e47SBjoern A. Zeeb icmp6len = ntohs(ip6->ip6_plen); 2199a4adf6ccSBjoern A. Zeeb if (m->m_len < off + icmp6len) { 2200a61b5cfbSBjoern A. Zeeb m = m_pullup(m, off + icmp6len); 2201a61b5cfbSBjoern A. Zeeb if (m == NULL) { 2202a61b5cfbSBjoern A. Zeeb IP6STAT_INC(ip6s_exthdrtoolong); 220382cd038dSYoshinobu Inoue return; 2204686cdd19SJun-ichiro itojun Hagino } 2205a4adf6ccSBjoern A. Zeeb } 2206a61b5cfbSBjoern A. Zeeb ip6 = mtod(m, struct ip6_hdr *); 2207a61b5cfbSBjoern A. Zeeb nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2208503f4e47SBjoern A. Zeeb 2209503f4e47SBjoern A. Zeeb ifp = m->m_pkthdr.rcvif; 2210686cdd19SJun-ichiro itojun Hagino redtgt6 = nd_rd->nd_rd_target; 2211686cdd19SJun-ichiro itojun Hagino reddst6 = nd_rd->nd_rd_dst; 221282cd038dSYoshinobu Inoue 2213503f4e47SBjoern A. Zeeb if (in6_setscope(&redtgt6, ifp, NULL) || 2214503f4e47SBjoern A. Zeeb in6_setscope(&reddst6, ifp, NULL)) { 2215a1f7e5f8SHajimu UMEMOTO goto freeit; 2216a1f7e5f8SHajimu UMEMOTO } 221782cd038dSYoshinobu Inoue 221882cd038dSYoshinobu Inoue /* validation */ 2219503f4e47SBjoern A. Zeeb src6 = ip6->ip6_src; 222082cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 222133841545SHajimu UMEMOTO nd6log((LOG_ERR, 222282cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 222306cd0a3fSHajimu UMEMOTO "must be from linklocal\n", 22241d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6))); 222533841545SHajimu UMEMOTO goto bad; 222682cd038dSYoshinobu Inoue } 22274caea9b1SMark Johnston if (__predict_false(ip6->ip6_hlim != 255)) { 22284caea9b1SMark Johnston ICMP6STAT_INC(icp6s_invlhlim); 222933841545SHajimu UMEMOTO nd6log((LOG_ERR, 223082cd038dSYoshinobu Inoue "ICMP6 redirect sent from %s rejected; " 223182cd038dSYoshinobu Inoue "hlim=%d (must be 255)\n", 22321d54aa3bSBjoern A. Zeeb ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim)); 223333841545SHajimu UMEMOTO goto bad; 223482cd038dSYoshinobu Inoue } 223582cd038dSYoshinobu Inoue { 223682cd038dSYoshinobu Inoue /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 22376ad7446cSAlexander V. Chernikov struct nhop_object *nh; 22389977be4aSAlexander V. Chernikov struct in6_addr kdst; 22399977be4aSAlexander V. Chernikov uint32_t scopeid; 224082cd038dSYoshinobu Inoue 22419977be4aSAlexander V. Chernikov in6_splitscope(&reddst6, &kdst, &scopeid); 22426ad7446cSAlexander V. Chernikov NET_EPOCH_ASSERT(); 22436ad7446cSAlexander V. Chernikov nh = fib6_lookup(ifp->if_fib, &kdst, scopeid, 0, 0); 2244eddfb2e8SAlexander V. Chernikov if (nh != NULL) { 22456ad7446cSAlexander V. Chernikov struct in6_addr nh_addr; 22466ad7446cSAlexander V. Chernikov nh_addr = ifatoia6(nh->nh_ifa)->ia_addr.sin6_addr; 22476ad7446cSAlexander V. Chernikov if ((nh->nh_flags & NHF_GATEWAY) == 0) { 224833841545SHajimu UMEMOTO nd6log((LOG_ERR, 2249deebc913SHajimu UMEMOTO "ICMP6 redirect rejected; no route " 2250deebc913SHajimu UMEMOTO "with inet6 gateway found for redirect dst: %s\n", 225133841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 225233841545SHajimu UMEMOTO goto bad; 2253deebc913SHajimu UMEMOTO } 2254deebc913SHajimu UMEMOTO 225543105e58SEric van Gyzen /* 22566ad7446cSAlexander V. Chernikov * Embed scope zone id into next hop address. 225743105e58SEric van Gyzen */ 22586ad7446cSAlexander V. Chernikov nh_addr = nh->gw6_sa.sin6_addr; 225943105e58SEric van Gyzen 22606ad7446cSAlexander V. Chernikov if (IN6_ARE_ADDR_EQUAL(&src6, &nh_addr) == 0) { 226133841545SHajimu UMEMOTO nd6log((LOG_ERR, 226282cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 226382cd038dSYoshinobu Inoue "not equal to gw-for-src=%s (must be same): " 226482cd038dSYoshinobu Inoue "%s\n", 22656ad7446cSAlexander V. Chernikov ip6_sprintf(ip6buf, &nh_addr), 226633841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 226733841545SHajimu UMEMOTO goto bad; 226882cd038dSYoshinobu Inoue } 226982cd038dSYoshinobu Inoue } else { 227033841545SHajimu UMEMOTO nd6log((LOG_ERR, 227182cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 227282cd038dSYoshinobu Inoue "no route found for redirect dst: %s\n", 227333841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 227433841545SHajimu UMEMOTO goto bad; 227582cd038dSYoshinobu Inoue } 227682cd038dSYoshinobu Inoue } 227782cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 227833841545SHajimu UMEMOTO nd6log((LOG_ERR, 227982cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 228082cd038dSYoshinobu Inoue "redirect dst must be unicast: %s\n", 228133841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 228233841545SHajimu UMEMOTO goto bad; 228382cd038dSYoshinobu Inoue } 228482cd038dSYoshinobu Inoue 228582cd038dSYoshinobu Inoue is_router = is_onlink = 0; 228682cd038dSYoshinobu Inoue if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 228782cd038dSYoshinobu Inoue is_router = 1; /* router case */ 228882cd038dSYoshinobu Inoue if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 228982cd038dSYoshinobu Inoue is_onlink = 1; /* on-link destination case */ 229082cd038dSYoshinobu Inoue if (!is_router && !is_onlink) { 229133841545SHajimu UMEMOTO nd6log((LOG_ERR, 229282cd038dSYoshinobu Inoue "ICMP6 redirect rejected; " 229382cd038dSYoshinobu Inoue "neither router case nor onlink case: %s\n", 229433841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 229533841545SHajimu UMEMOTO goto bad; 229682cd038dSYoshinobu Inoue } 229782cd038dSYoshinobu Inoue 229882cd038dSYoshinobu Inoue icmp6len -= sizeof(*nd_rd); 229982cd038dSYoshinobu Inoue nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 230082cd038dSYoshinobu Inoue if (nd6_options(&ndopts) < 0) { 230137c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n", 230237c1ff48SGleb Smirnoff __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 230333841545SHajimu UMEMOTO /* nd6_options have incremented stats */ 2304686cdd19SJun-ichiro itojun Hagino goto freeit; 230582cd038dSYoshinobu Inoue } 230682cd038dSYoshinobu Inoue 2307503f4e47SBjoern A. Zeeb lladdr = NULL; 2308503f4e47SBjoern A. Zeeb lladdrlen = 0; 230982cd038dSYoshinobu Inoue if (ndopts.nd_opts_tgt_lladdr) { 231082cd038dSYoshinobu Inoue lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 231182cd038dSYoshinobu Inoue lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 231282cd038dSYoshinobu Inoue } 231382cd038dSYoshinobu Inoue 231482cd038dSYoshinobu Inoue if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 231537c1ff48SGleb Smirnoff nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s " 231682cd038dSYoshinobu Inoue "(if %d, icmp6 packet %d): %s\n", 231737c1ff48SGleb Smirnoff __func__, ip6_sprintf(ip6buf, &redtgt6), 23181d54aa3bSBjoern A. Zeeb ifp->if_addrlen, lladdrlen - 2, 231933841545SHajimu UMEMOTO icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 232033841545SHajimu UMEMOTO goto bad; 232182cd038dSYoshinobu Inoue } 232282cd038dSYoshinobu Inoue 2323bfbc08b8SBjoern A. Zeeb /* Validation passed. */ 2324bfbc08b8SBjoern A. Zeeb 232582cd038dSYoshinobu Inoue /* RFC 2461 8.3 */ 232682cd038dSYoshinobu Inoue nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 232782cd038dSYoshinobu Inoue is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 232882cd038dSYoshinobu Inoue 232917a03656SEric van Gyzen /* 233017a03656SEric van Gyzen * Install a gateway route in the better-router case or an interface 233117a03656SEric van Gyzen * route in the on-link-destination case. 233217a03656SEric van Gyzen */ 233317a03656SEric van Gyzen { 233482cd038dSYoshinobu Inoue struct sockaddr_in6 sdst; 233582cd038dSYoshinobu Inoue struct sockaddr_in6 sgw; 233682cd038dSYoshinobu Inoue struct sockaddr_in6 ssrc; 233717a03656SEric van Gyzen struct sockaddr *gw; 233817a03656SEric van Gyzen int rt_flags; 233981d5d46bSBjoern A. Zeeb u_int fibnum; 234082cd038dSYoshinobu Inoue 234182cd038dSYoshinobu Inoue bzero(&sdst, sizeof(sdst)); 234282cd038dSYoshinobu Inoue bzero(&ssrc, sizeof(ssrc)); 234317a03656SEric van Gyzen sdst.sin6_family = ssrc.sin6_family = AF_INET6; 234417a03656SEric van Gyzen sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6); 234582cd038dSYoshinobu Inoue bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 234682cd038dSYoshinobu Inoue bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 234734a5582cSAlexander V. Chernikov rt_flags = 0; 234817a03656SEric van Gyzen if (is_router) { 234917a03656SEric van Gyzen bzero(&sgw, sizeof(sgw)); 235017a03656SEric van Gyzen sgw.sin6_family = AF_INET6; 235117a03656SEric van Gyzen sgw.sin6_len = sizeof(struct sockaddr_in6); 235217a03656SEric van Gyzen bcopy(&redtgt6, &sgw.sin6_addr, 235317a03656SEric van Gyzen sizeof(struct in6_addr)); 235417a03656SEric van Gyzen gw = (struct sockaddr *)&sgw; 235517a03656SEric van Gyzen rt_flags |= RTF_GATEWAY; 235617a03656SEric van Gyzen } else 235717a03656SEric van Gyzen gw = ifp->if_addr->ifa_addr; 235881d5d46bSBjoern A. Zeeb for (fibnum = 0; fibnum < rt_numfibs; fibnum++) 235934a5582cSAlexander V. Chernikov rib_add_redirect(fibnum, (struct sockaddr *)&sdst, gw, 236034a5582cSAlexander V. Chernikov (struct sockaddr *)&ssrc, ifp, rt_flags, 236134a5582cSAlexander V. Chernikov V_icmp6_redirtimeout); 236282cd038dSYoshinobu Inoue } 2363686cdd19SJun-ichiro itojun Hagino 2364686cdd19SJun-ichiro itojun Hagino freeit: 2365686cdd19SJun-ichiro itojun Hagino m_freem(m); 236633841545SHajimu UMEMOTO return; 236733841545SHajimu UMEMOTO 236833841545SHajimu UMEMOTO bad: 2369e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_badredirect); 237033841545SHajimu UMEMOTO m_freem(m); 237182cd038dSYoshinobu Inoue } 237282cd038dSYoshinobu Inoue 237382cd038dSYoshinobu Inoue void 23749ac7c6cfSAlexander V. Chernikov icmp6_redirect_output(struct mbuf *m0, struct nhop_object *nh) 237582cd038dSYoshinobu Inoue { 237682cd038dSYoshinobu Inoue struct ifnet *ifp; /* my outgoing interface */ 237782cd038dSYoshinobu Inoue struct in6_addr *ifp_ll6; 237882cd038dSYoshinobu Inoue struct in6_addr *router_ll6; 237982cd038dSYoshinobu Inoue struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 238082cd038dSYoshinobu Inoue struct mbuf *m = NULL; /* newly allocated one */ 23811db8d1f8SAna Kukec struct m_tag *mtag; 238282cd038dSYoshinobu Inoue struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 238382cd038dSYoshinobu Inoue struct nd_redirect *nd_rd; 238456c423b0SKip Macy struct llentry *ln = NULL; 238582cd038dSYoshinobu Inoue size_t maxlen; 238682cd038dSYoshinobu Inoue u_char *p; 238782cd038dSYoshinobu Inoue struct ifnet *outif = NULL; 2388686cdd19SJun-ichiro itojun Hagino struct sockaddr_in6 src_sa; 2389686cdd19SJun-ichiro itojun Hagino 239049dc650cSAndrey V. Elsukov icmp6_errcount(ND_REDIRECT, 0); 239182cd038dSYoshinobu Inoue 239282cd038dSYoshinobu Inoue /* if we are not router, we don't send icmp6 redirect */ 2393603724d3SBjoern A. Zeeb if (!V_ip6_forwarding) 239482cd038dSYoshinobu Inoue goto fail; 239582cd038dSYoshinobu Inoue 239682cd038dSYoshinobu Inoue /* sanity check */ 23979ac7c6cfSAlexander V. Chernikov if (!m0 || !nh || !(NH_IS_VALID(nh)) || !(ifp = nh->nh_ifp)) 239882cd038dSYoshinobu Inoue goto fail; 239982cd038dSYoshinobu Inoue 240082cd038dSYoshinobu Inoue /* 240182cd038dSYoshinobu Inoue * Address check: 240282cd038dSYoshinobu Inoue * the source address must identify a neighbor, and 240382cd038dSYoshinobu Inoue * the destination address must not be a multicast address 240482cd038dSYoshinobu Inoue * [RFC 2461, sec 8.2] 240582cd038dSYoshinobu Inoue */ 240682cd038dSYoshinobu Inoue sip6 = mtod(m0, struct ip6_hdr *); 2407686cdd19SJun-ichiro itojun Hagino bzero(&src_sa, sizeof(src_sa)); 2408686cdd19SJun-ichiro itojun Hagino src_sa.sin6_family = AF_INET6; 2409686cdd19SJun-ichiro itojun Hagino src_sa.sin6_len = sizeof(src_sa); 2410686cdd19SJun-ichiro itojun Hagino src_sa.sin6_addr = sip6->ip6_src; 2411686cdd19SJun-ichiro itojun Hagino if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 241282cd038dSYoshinobu Inoue goto fail; 241382cd038dSYoshinobu Inoue if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 241482cd038dSYoshinobu Inoue goto fail; /* what should we do here? */ 241582cd038dSYoshinobu Inoue 241682cd038dSYoshinobu Inoue /* rate limit */ 241782cd038dSYoshinobu Inoue if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 241882cd038dSYoshinobu Inoue goto fail; 241982cd038dSYoshinobu Inoue 242082cd038dSYoshinobu Inoue /* 242182cd038dSYoshinobu Inoue * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 242282cd038dSYoshinobu Inoue * we almost always ask for an mbuf cluster for simplicity. 242382cd038dSYoshinobu Inoue * (MHLEN < IPV6_MMTU is almost always true) 242482cd038dSYoshinobu Inoue */ 2425686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES 2426686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES 2427686cdd19SJun-ichiro itojun Hagino #endif 24287b07d1beSGleb Smirnoff m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 24297b07d1beSGleb Smirnoff if (m == NULL) 243082cd038dSYoshinobu Inoue goto fail; 24319ac7c6cfSAlexander V. Chernikov M_SETFIB(m, M_GETFIB(m0)); 243233841545SHajimu UMEMOTO maxlen = M_TRAILINGSPACE(m); 243382cd038dSYoshinobu Inoue maxlen = min(IPV6_MMTU, maxlen); 243482cd038dSYoshinobu Inoue /* just for safety */ 2435686cdd19SJun-ichiro itojun Hagino if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2436686cdd19SJun-ichiro itojun Hagino ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 243782cd038dSYoshinobu Inoue goto fail; 2438686cdd19SJun-ichiro itojun Hagino } 243982cd038dSYoshinobu Inoue 244082cd038dSYoshinobu Inoue { 244182cd038dSYoshinobu Inoue /* get ip6 linklocal address for ifp(my outgoing interface). */ 2442686cdd19SJun-ichiro itojun Hagino struct in6_ifaddr *ia; 2443686cdd19SJun-ichiro itojun Hagino if ((ia = in6ifa_ifpforlinklocal(ifp, 2444686cdd19SJun-ichiro itojun Hagino IN6_IFF_NOTREADY| 2445686cdd19SJun-ichiro itojun Hagino IN6_IFF_ANYCAST)) == NULL) 244682cd038dSYoshinobu Inoue goto fail; 244782cd038dSYoshinobu Inoue ifp_ll6 = &ia->ia_addr.sin6_addr; 24488c0fec80SRobert Watson /* XXXRW: reference released prematurely. */ 24498c0fec80SRobert Watson ifa_free(&ia->ia_ifa); 245082cd038dSYoshinobu Inoue } 245182cd038dSYoshinobu Inoue 245282cd038dSYoshinobu Inoue /* get ip6 linklocal address for the router. */ 24539ac7c6cfSAlexander V. Chernikov if (nh->nh_flags & NHF_GATEWAY) { 245482cd038dSYoshinobu Inoue struct sockaddr_in6 *sin6; 24559ac7c6cfSAlexander V. Chernikov sin6 = &nh->gw6_sa; 245682cd038dSYoshinobu Inoue router_ll6 = &sin6->sin6_addr; 245782cd038dSYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 245882cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 245982cd038dSYoshinobu Inoue } else 246082cd038dSYoshinobu Inoue router_ll6 = (struct in6_addr *)NULL; 246182cd038dSYoshinobu Inoue 246282cd038dSYoshinobu Inoue /* ip6 */ 246382cd038dSYoshinobu Inoue ip6 = mtod(m, struct ip6_hdr *); 246482cd038dSYoshinobu Inoue ip6->ip6_flow = 0; 2465686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2466686cdd19SJun-ichiro itojun Hagino ip6->ip6_vfc |= IPV6_VERSION; 246782cd038dSYoshinobu Inoue /* ip6->ip6_plen will be set later */ 246882cd038dSYoshinobu Inoue ip6->ip6_nxt = IPPROTO_ICMPV6; 246982cd038dSYoshinobu Inoue ip6->ip6_hlim = 255; 247082cd038dSYoshinobu Inoue /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 247182cd038dSYoshinobu Inoue bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 247282cd038dSYoshinobu Inoue bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 247382cd038dSYoshinobu Inoue 247482cd038dSYoshinobu Inoue /* ND Redirect */ 247582cd038dSYoshinobu Inoue nd_rd = (struct nd_redirect *)(ip6 + 1); 247682cd038dSYoshinobu Inoue nd_rd->nd_rd_type = ND_REDIRECT; 247782cd038dSYoshinobu Inoue nd_rd->nd_rd_code = 0; 247882cd038dSYoshinobu Inoue nd_rd->nd_rd_reserved = 0; 24799ac7c6cfSAlexander V. Chernikov if (nh->nh_flags & NHF_GATEWAY) { 248082cd038dSYoshinobu Inoue /* 248182cd038dSYoshinobu Inoue * nd_rd->nd_rd_target must be a link-local address in 248282cd038dSYoshinobu Inoue * better router cases. 248382cd038dSYoshinobu Inoue */ 248482cd038dSYoshinobu Inoue if (!router_ll6) 248582cd038dSYoshinobu Inoue goto fail; 248682cd038dSYoshinobu Inoue bcopy(router_ll6, &nd_rd->nd_rd_target, 248782cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 248882cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 248982cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 249082cd038dSYoshinobu Inoue } else { 249182cd038dSYoshinobu Inoue /* make sure redtgt == reddst */ 249282cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 249382cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_target)); 249482cd038dSYoshinobu Inoue bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 249582cd038dSYoshinobu Inoue sizeof(nd_rd->nd_rd_dst)); 249682cd038dSYoshinobu Inoue } 249782cd038dSYoshinobu Inoue 249882cd038dSYoshinobu Inoue p = (u_char *)(nd_rd + 1); 249982cd038dSYoshinobu Inoue 250082cd038dSYoshinobu Inoue if (!router_ll6) 250182cd038dSYoshinobu Inoue goto nolladdropt; 250282cd038dSYoshinobu Inoue 250382cd038dSYoshinobu Inoue { 250482cd038dSYoshinobu Inoue /* target lladdr option */ 250582cd038dSYoshinobu Inoue int len; 250682cd038dSYoshinobu Inoue struct nd_opt_hdr *nd_opt; 250782cd038dSYoshinobu Inoue char *lladdr; 250882cd038dSYoshinobu Inoue 2509c541bd36SAlexander V. Chernikov ln = nd6_lookup(router_ll6, LLE_SF(AF_INET6, 0), ifp); 251056c423b0SKip Macy if (ln == NULL) 251182cd038dSYoshinobu Inoue goto nolladdropt; 25126e6b3f7cSQing Li 2513686cdd19SJun-ichiro itojun Hagino len = sizeof(*nd_opt) + ifp->if_addrlen; 2514686cdd19SJun-ichiro itojun Hagino len = (len + 7) & ~7; /* round by 8 */ 2515686cdd19SJun-ichiro itojun Hagino /* safety check */ 2516686cdd19SJun-ichiro itojun Hagino if (len + (p - (u_char *)ip6) > maxlen) 2517686cdd19SJun-ichiro itojun Hagino goto nolladdropt; 25186e6b3f7cSQing Li 25196e6b3f7cSQing Li if (ln->la_flags & LLE_VALID) { 252082cd038dSYoshinobu Inoue nd_opt = (struct nd_opt_hdr *)p; 252182cd038dSYoshinobu Inoue nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 252282cd038dSYoshinobu Inoue nd_opt->nd_opt_len = len >> 3; 252382cd038dSYoshinobu Inoue lladdr = (char *)(nd_opt + 1); 25244fb3a820SAlexander V. Chernikov bcopy(ln->ll_addr, lladdr, ifp->if_addrlen); 2525686cdd19SJun-ichiro itojun Hagino p += len; 252682cd038dSYoshinobu Inoue } 252782cd038dSYoshinobu Inoue } 252856c423b0SKip Macy nolladdropt: 252956c423b0SKip Macy if (ln != NULL) 253056c423b0SKip Macy LLE_RUNLOCK(ln); 253182cd038dSYoshinobu Inoue 253282cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 253382cd038dSYoshinobu Inoue 253482cd038dSYoshinobu Inoue /* just to be safe */ 2535686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED /*not openbsd*/ 253682cd038dSYoshinobu Inoue if (m0->m_flags & M_DECRYPTED) 253782cd038dSYoshinobu Inoue goto noredhdropt; 2538686cdd19SJun-ichiro itojun Hagino #endif 2539686cdd19SJun-ichiro itojun Hagino if (p - (u_char *)ip6 > maxlen) 2540686cdd19SJun-ichiro itojun Hagino goto noredhdropt; 254182cd038dSYoshinobu Inoue 254282cd038dSYoshinobu Inoue { 254382cd038dSYoshinobu Inoue /* redirected header option */ 254482cd038dSYoshinobu Inoue int len; 254582cd038dSYoshinobu Inoue struct nd_opt_rd_hdr *nd_opt_rh; 254682cd038dSYoshinobu Inoue 254782cd038dSYoshinobu Inoue /* 254882cd038dSYoshinobu Inoue * compute the maximum size for icmp6 redirect header option. 254982cd038dSYoshinobu Inoue * XXX room for auth header? 255082cd038dSYoshinobu Inoue */ 255182cd038dSYoshinobu Inoue len = maxlen - (p - (u_char *)ip6); 255282cd038dSYoshinobu Inoue len &= ~7; 255382cd038dSYoshinobu Inoue 255482cd038dSYoshinobu Inoue /* This is just for simplicity. */ 255582cd038dSYoshinobu Inoue if (m0->m_pkthdr.len != m0->m_len) { 255682cd038dSYoshinobu Inoue if (m0->m_next) { 255782cd038dSYoshinobu Inoue m_freem(m0->m_next); 255882cd038dSYoshinobu Inoue m0->m_next = NULL; 255982cd038dSYoshinobu Inoue } 256082cd038dSYoshinobu Inoue m0->m_pkthdr.len = m0->m_len; 256182cd038dSYoshinobu Inoue } 256282cd038dSYoshinobu Inoue 256382cd038dSYoshinobu Inoue /* 256482cd038dSYoshinobu Inoue * Redirected header option spec (RFC2461 4.6.3) talks nothing 256582cd038dSYoshinobu Inoue * about padding/truncate rule for the original IP packet. 256606cd0a3fSHajimu UMEMOTO * From the discussion on IPv6imp in Feb 1999, 256706cd0a3fSHajimu UMEMOTO * the consensus was: 256882cd038dSYoshinobu Inoue * - "attach as much as possible" is the goal 256906cd0a3fSHajimu UMEMOTO * - pad if not aligned (original size can be guessed by 257006cd0a3fSHajimu UMEMOTO * original ip6 header) 257182cd038dSYoshinobu Inoue * Following code adds the padding if it is simple enough, 257282cd038dSYoshinobu Inoue * and truncates if not. 257382cd038dSYoshinobu Inoue */ 257482cd038dSYoshinobu Inoue if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 257506cd0a3fSHajimu UMEMOTO panic("assumption failed in %s:%d", __FILE__, 257606cd0a3fSHajimu UMEMOTO __LINE__); 257782cd038dSYoshinobu Inoue 257882cd038dSYoshinobu Inoue if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 257982cd038dSYoshinobu Inoue /* not enough room, truncate */ 258006cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 258106cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 258282cd038dSYoshinobu Inoue } else { 258382cd038dSYoshinobu Inoue /* enough room, pad or truncate */ 258482cd038dSYoshinobu Inoue size_t extra; 258582cd038dSYoshinobu Inoue 258682cd038dSYoshinobu Inoue extra = m0->m_pkthdr.len % 8; 258782cd038dSYoshinobu Inoue if (extra) { 258882cd038dSYoshinobu Inoue /* pad if easy enough, truncate if not */ 258982cd038dSYoshinobu Inoue if (8 - extra <= M_TRAILINGSPACE(m0)) { 259082cd038dSYoshinobu Inoue /* pad */ 259182cd038dSYoshinobu Inoue m0->m_len += (8 - extra); 259282cd038dSYoshinobu Inoue m0->m_pkthdr.len += (8 - extra); 259382cd038dSYoshinobu Inoue } else { 259482cd038dSYoshinobu Inoue /* truncate */ 259582cd038dSYoshinobu Inoue m0->m_pkthdr.len -= extra; 259682cd038dSYoshinobu Inoue m0->m_len -= extra; 259782cd038dSYoshinobu Inoue } 259882cd038dSYoshinobu Inoue } 259982cd038dSYoshinobu Inoue len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 260006cd0a3fSHajimu UMEMOTO m0->m_pkthdr.len = m0->m_len = len - 260106cd0a3fSHajimu UMEMOTO sizeof(*nd_opt_rh); 260282cd038dSYoshinobu Inoue } 260382cd038dSYoshinobu Inoue 260482cd038dSYoshinobu Inoue nd_opt_rh = (struct nd_opt_rd_hdr *)p; 260582cd038dSYoshinobu Inoue bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 260682cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 260782cd038dSYoshinobu Inoue nd_opt_rh->nd_opt_rh_len = len >> 3; 260882cd038dSYoshinobu Inoue p += sizeof(*nd_opt_rh); 260982cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 261082cd038dSYoshinobu Inoue 261182cd038dSYoshinobu Inoue /* connect m0 to m */ 2612db06e8a0SSUZUKI Shinsuke m_tag_delete_chain(m0, NULL); 2613db06e8a0SSUZUKI Shinsuke m0->m_flags &= ~M_PKTHDR; 261482cd038dSYoshinobu Inoue m->m_next = m0; 261582cd038dSYoshinobu Inoue m->m_pkthdr.len = m->m_len + m0->m_len; 2616db06e8a0SSUZUKI Shinsuke m0 = NULL; 261782cd038dSYoshinobu Inoue } 261882cd038dSYoshinobu Inoue noredhdropt:; 2619db06e8a0SSUZUKI Shinsuke if (m0) { 2620db06e8a0SSUZUKI Shinsuke m_freem(m0); 2621db06e8a0SSUZUKI Shinsuke m0 = NULL; 2622db06e8a0SSUZUKI Shinsuke } 262382cd038dSYoshinobu Inoue 26249a4f9608SHajimu UMEMOTO /* XXX: clear embedded link IDs in the inner header */ 26259a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_src); 26269a4f9608SHajimu UMEMOTO in6_clearscope(&sip6->ip6_dst); 26279a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_target); 26289a4f9608SHajimu UMEMOTO in6_clearscope(&nd_rd->nd_rd_dst); 262982cd038dSYoshinobu Inoue 263082cd038dSYoshinobu Inoue ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 263182cd038dSYoshinobu Inoue 263282cd038dSYoshinobu Inoue nd_rd->nd_rd_cksum = 0; 263306cd0a3fSHajimu UMEMOTO nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 263406cd0a3fSHajimu UMEMOTO sizeof(*ip6), ntohs(ip6->ip6_plen)); 263582cd038dSYoshinobu Inoue 26361db8d1f8SAna Kukec if (send_sendso_input_hook != NULL) { 26371db8d1f8SAna Kukec mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short), 26381db8d1f8SAna Kukec M_NOWAIT); 26391db8d1f8SAna Kukec if (mtag == NULL) 26401db8d1f8SAna Kukec goto fail; 26411db8d1f8SAna Kukec *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type; 26421db8d1f8SAna Kukec m_tag_prepend(m, mtag); 26431db8d1f8SAna Kukec } 26441db8d1f8SAna Kukec 264582cd038dSYoshinobu Inoue /* send the packet to outside... */ 26465d846453SSam Leffler ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 264782cd038dSYoshinobu Inoue if (outif) { 264882cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_msg); 264982cd038dSYoshinobu Inoue icmp6_ifstat_inc(outif, ifs6_out_redirect); 265082cd038dSYoshinobu Inoue } 2651e27b0c87SRobert Watson ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]); 265282cd038dSYoshinobu Inoue 265382cd038dSYoshinobu Inoue return; 265482cd038dSYoshinobu Inoue 265582cd038dSYoshinobu Inoue fail: 265682cd038dSYoshinobu Inoue if (m) 265782cd038dSYoshinobu Inoue m_freem(m); 265882cd038dSYoshinobu Inoue if (m0) 265982cd038dSYoshinobu Inoue m_freem(m0); 266082cd038dSYoshinobu Inoue } 266182cd038dSYoshinobu Inoue 266282cd038dSYoshinobu Inoue /* 266382cd038dSYoshinobu Inoue * ICMPv6 socket option processing. 266482cd038dSYoshinobu Inoue */ 266582cd038dSYoshinobu Inoue int 26661272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt) 266782cd038dSYoshinobu Inoue { 266882cd038dSYoshinobu Inoue int error = 0; 266982cd038dSYoshinobu Inoue int optlen; 267033841545SHajimu UMEMOTO struct inpcb *inp = sotoinpcb(so); 267182cd038dSYoshinobu Inoue int level, op, optname; 267282cd038dSYoshinobu Inoue 267382cd038dSYoshinobu Inoue if (sopt) { 267482cd038dSYoshinobu Inoue level = sopt->sopt_level; 267582cd038dSYoshinobu Inoue op = sopt->sopt_dir; 267682cd038dSYoshinobu Inoue optname = sopt->sopt_name; 267782cd038dSYoshinobu Inoue optlen = sopt->sopt_valsize; 267882cd038dSYoshinobu Inoue } else 267982cd038dSYoshinobu Inoue level = op = optname = optlen = 0; 268033841545SHajimu UMEMOTO 268182cd038dSYoshinobu Inoue if (level != IPPROTO_ICMPV6) { 268282cd038dSYoshinobu Inoue return EINVAL; 268382cd038dSYoshinobu Inoue } 268482cd038dSYoshinobu Inoue 268582cd038dSYoshinobu Inoue switch (op) { 268682cd038dSYoshinobu Inoue case PRCO_SETOPT: 268782cd038dSYoshinobu Inoue switch (optname) { 268882cd038dSYoshinobu Inoue case ICMP6_FILTER: 268982cd038dSYoshinobu Inoue { 2690ae89d5a3SRobert Watson struct icmp6_filter ic6f; 269182cd038dSYoshinobu Inoue 2692ae89d5a3SRobert Watson if (optlen != sizeof(ic6f)) { 269382cd038dSYoshinobu Inoue error = EMSGSIZE; 269482cd038dSYoshinobu Inoue break; 269582cd038dSYoshinobu Inoue } 2696ae89d5a3SRobert Watson error = sooptcopyin(sopt, &ic6f, optlen, optlen); 2697ae89d5a3SRobert Watson if (error == 0) { 2698ae89d5a3SRobert Watson INP_WLOCK(inp); 2699ae89d5a3SRobert Watson *inp->in6p_icmp6filt = ic6f; 2700ae89d5a3SRobert Watson INP_WUNLOCK(inp); 2701ae89d5a3SRobert Watson } 270282cd038dSYoshinobu Inoue break; 270382cd038dSYoshinobu Inoue } 270482cd038dSYoshinobu Inoue 270582cd038dSYoshinobu Inoue default: 270682cd038dSYoshinobu Inoue error = ENOPROTOOPT; 270782cd038dSYoshinobu Inoue break; 270882cd038dSYoshinobu Inoue } 270982cd038dSYoshinobu Inoue break; 271082cd038dSYoshinobu Inoue 271182cd038dSYoshinobu Inoue case PRCO_GETOPT: 271282cd038dSYoshinobu Inoue switch (optname) { 271382cd038dSYoshinobu Inoue case ICMP6_FILTER: 271482cd038dSYoshinobu Inoue { 2715ae89d5a3SRobert Watson struct icmp6_filter ic6f; 2716ae89d5a3SRobert Watson 2717ae89d5a3SRobert Watson INP_RLOCK(inp); 2718ae89d5a3SRobert Watson ic6f = *inp->in6p_icmp6filt; 2719ae89d5a3SRobert Watson INP_RUNLOCK(inp); 2720ae89d5a3SRobert Watson error = sooptcopyout(sopt, &ic6f, sizeof(ic6f)); 272182cd038dSYoshinobu Inoue break; 272282cd038dSYoshinobu Inoue } 272382cd038dSYoshinobu Inoue 272482cd038dSYoshinobu Inoue default: 272582cd038dSYoshinobu Inoue error = ENOPROTOOPT; 272682cd038dSYoshinobu Inoue break; 272782cd038dSYoshinobu Inoue } 272882cd038dSYoshinobu Inoue break; 272982cd038dSYoshinobu Inoue } 273082cd038dSYoshinobu Inoue 273182cd038dSYoshinobu Inoue return (error); 273282cd038dSYoshinobu Inoue } 273382cd038dSYoshinobu Inoue 2734a03aff88SGleb Smirnoff static int sysctl_icmp6lim_and_jitter(SYSCTL_HANDLER_ARGS); 2735a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(u_int, icmp6errppslim) = 100; 2736a03aff88SGleb Smirnoff #define V_icmp6errppslim VNET(icmp6errppslim) 2737a03aff88SGleb Smirnoff SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit, 2738a03aff88SGleb Smirnoff CTLTYPE_UINT | CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0, 2739a03aff88SGleb Smirnoff &sysctl_icmp6lim_and_jitter, "IU", 2740a03aff88SGleb Smirnoff "Maximum number of ICMPv6 error/reply messages per second"); 2741a03aff88SGleb Smirnoff 2742a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6lim_curr_jitter) = 0; 2743a03aff88SGleb Smirnoff #define V_icmp6lim_curr_jitter VNET(icmp6lim_curr_jitter) 2744a03aff88SGleb Smirnoff 2745a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(u_int, icmp6lim_jitter) = 8; 2746a03aff88SGleb Smirnoff #define V_icmp6lim_jitter VNET(icmp6lim_jitter) 2747a03aff88SGleb Smirnoff SYSCTL_PROC(_net_inet6_icmp6, OID_AUTO, icmp6lim_jitter, CTLTYPE_UINT | 2748a03aff88SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6lim_jitter), 0, 2749a03aff88SGleb Smirnoff &sysctl_icmp6lim_and_jitter, "IU", 2750a03aff88SGleb Smirnoff "Random errppslimit jitter adjustment limit"); 2751a03aff88SGleb Smirnoff 2752a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6lim_output) = 1; 2753a03aff88SGleb Smirnoff #define V_icmp6lim_output VNET(icmp6lim_output) 2754a03aff88SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, icmp6lim_output, 2755a03aff88SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6lim_output), 0, 2756a03aff88SGleb Smirnoff "Enable logging of ICMPv6 response rate limiting"); 2757a03aff88SGleb Smirnoff 2758a03aff88SGleb Smirnoff typedef enum { 2759a03aff88SGleb Smirnoff RATELIM_PARAM_PROB = 0, 2760a03aff88SGleb Smirnoff RATELIM_TOO_BIG, 2761a03aff88SGleb Smirnoff RATELIM_UNREACH, 2762a03aff88SGleb Smirnoff RATELIM_TEXCEED, 2763a03aff88SGleb Smirnoff RATELIM_REDIR, 2764a03aff88SGleb Smirnoff RATELIM_REPLY, 2765a03aff88SGleb Smirnoff RATELIM_OTHER, 2766a03aff88SGleb Smirnoff RATELIM_MAX 2767a03aff88SGleb Smirnoff } ratelim_which; 2768a03aff88SGleb Smirnoff 2769a03aff88SGleb Smirnoff static const char *icmp6_rate_descrs[RATELIM_MAX] = { 2770a03aff88SGleb Smirnoff [RATELIM_PARAM_PROB] = "bad IPv6 header", 2771a03aff88SGleb Smirnoff [RATELIM_TOO_BIG] = "packet too big", 2772a03aff88SGleb Smirnoff [RATELIM_UNREACH] = "destination unreachable", 2773a03aff88SGleb Smirnoff [RATELIM_TEXCEED] = "time exceeded", 2774a03aff88SGleb Smirnoff [RATELIM_REPLY] = "echo reply", 2775a03aff88SGleb Smirnoff [RATELIM_REDIR] = "neighbor discovery redirect", 2776a03aff88SGleb Smirnoff [RATELIM_OTHER] = "(other)", 2777a03aff88SGleb Smirnoff }; 2778a03aff88SGleb Smirnoff 2779a03aff88SGleb Smirnoff static void 2780a03aff88SGleb Smirnoff icmp6lim_new_jitter(void) 2781a03aff88SGleb Smirnoff { 2782a03aff88SGleb Smirnoff /* 2783a03aff88SGleb Smirnoff * Adjust limit +/- to jitter the measurement to deny a side-channel 2784a03aff88SGleb Smirnoff * port scan as in https://dl.acm.org/doi/10.1145/3372297.3417280 2785a03aff88SGleb Smirnoff */ 2786a03aff88SGleb Smirnoff if (V_icmp6lim_jitter > 0) 2787a03aff88SGleb Smirnoff V_icmp6lim_curr_jitter = 2788a03aff88SGleb Smirnoff arc4random_uniform(V_icmp6lim_jitter * 2 + 1) - 2789a03aff88SGleb Smirnoff V_icmp6lim_jitter; 2790a03aff88SGleb Smirnoff } 2791a03aff88SGleb Smirnoff 2792a03aff88SGleb Smirnoff static int 2793a03aff88SGleb Smirnoff sysctl_icmp6lim_and_jitter(SYSCTL_HANDLER_ARGS) 2794a03aff88SGleb Smirnoff { 2795a03aff88SGleb Smirnoff uint32_t new; 2796a03aff88SGleb Smirnoff int error; 2797a03aff88SGleb Smirnoff bool lim; 2798a03aff88SGleb Smirnoff 2799a03aff88SGleb Smirnoff MPASS(oidp->oid_arg1 == &VNET_NAME(icmp6errppslim) || 2800a03aff88SGleb Smirnoff oidp->oid_arg1 == &VNET_NAME(icmp6lim_jitter)); 2801a03aff88SGleb Smirnoff 2802a03aff88SGleb Smirnoff lim = (oidp->oid_arg1 == &VNET_NAME(icmp6errppslim)); 2803a03aff88SGleb Smirnoff new = lim ? V_icmp6errppslim : V_icmp6lim_jitter; 2804a03aff88SGleb Smirnoff error = sysctl_handle_int(oidp, &new, 0, req); 2805a03aff88SGleb Smirnoff if (error == 0 && req->newptr) { 2806a03aff88SGleb Smirnoff if (lim) { 2807*4399e055SGleb Smirnoff if (new != 0 && new <= V_icmp6lim_jitter) 2808a03aff88SGleb Smirnoff error = EINVAL; 2809a03aff88SGleb Smirnoff else 2810a03aff88SGleb Smirnoff V_icmp6errppslim = new; 2811a03aff88SGleb Smirnoff } else { 2812a03aff88SGleb Smirnoff if (new >= V_icmp6errppslim) 2813a03aff88SGleb Smirnoff error = EINVAL; 2814a03aff88SGleb Smirnoff else { 2815a03aff88SGleb Smirnoff V_icmp6lim_jitter = new; 2816a03aff88SGleb Smirnoff icmp6lim_new_jitter(); 2817a03aff88SGleb Smirnoff } 2818a03aff88SGleb Smirnoff } 2819a03aff88SGleb Smirnoff } 2820a03aff88SGleb Smirnoff MPASS(V_icmp6errppslim + V_icmp6lim_curr_jitter > 0); 2821a03aff88SGleb Smirnoff 2822a03aff88SGleb Smirnoff return (error); 2823a03aff88SGleb Smirnoff } 2824a03aff88SGleb Smirnoff 2825a03aff88SGleb Smirnoff 2826a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(struct counter_rate, icmp6_rates[RATELIM_MAX]); 2827a03aff88SGleb Smirnoff #define V_icmp6_rates VNET(icmp6_rates) 2828a03aff88SGleb Smirnoff 2829a03aff88SGleb Smirnoff static void 2830a03aff88SGleb Smirnoff icmp6_ratelimit_init(void) 2831a03aff88SGleb Smirnoff { 2832a03aff88SGleb Smirnoff 2833a03aff88SGleb Smirnoff for (int i = 0; i < RATELIM_MAX; i++) { 2834a03aff88SGleb Smirnoff V_icmp6_rates[i].cr_rate = counter_u64_alloc(M_WAITOK); 2835a03aff88SGleb Smirnoff V_icmp6_rates[i].cr_ticks = ticks; 2836a03aff88SGleb Smirnoff } 2837a03aff88SGleb Smirnoff icmp6lim_new_jitter(); 2838a03aff88SGleb Smirnoff } 2839a03aff88SGleb Smirnoff VNET_SYSINIT(icmp6_ratelimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, 2840a03aff88SGleb Smirnoff icmp6_ratelimit_init, NULL); 2841a03aff88SGleb Smirnoff 2842a03aff88SGleb Smirnoff #ifdef VIMAGE 2843a03aff88SGleb Smirnoff static void 2844a03aff88SGleb Smirnoff icmp6_ratelimit_uninit(void) 2845a03aff88SGleb Smirnoff { 2846a03aff88SGleb Smirnoff 2847a03aff88SGleb Smirnoff for (int i = 0; i < RATELIM_MAX; i++) 2848a03aff88SGleb Smirnoff counter_u64_free(V_icmp6_rates[i].cr_rate); 2849a03aff88SGleb Smirnoff } 2850a03aff88SGleb Smirnoff VNET_SYSUNINIT(icmp6_ratelimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, 2851a03aff88SGleb Smirnoff icmp6_ratelimit_uninit, NULL); 2852a03aff88SGleb Smirnoff #endif 2853a03aff88SGleb Smirnoff 285482cd038dSYoshinobu Inoue /* 285582cd038dSYoshinobu Inoue * Perform rate limit check. 285682cd038dSYoshinobu Inoue * Returns 0 if it is okay to send the icmp6 packet. 285782cd038dSYoshinobu Inoue * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 285882cd038dSYoshinobu Inoue * limitation. 285982cd038dSYoshinobu Inoue * 286082cd038dSYoshinobu Inoue * XXX per-destination/type check necessary? 28611272577eSXin LI * 28621272577eSXin LI * dst - not used at this moment 28631272577eSXin LI * code - not used at this moment 286482cd038dSYoshinobu Inoue */ 2865a974702eSKristof Provost int 2866a03aff88SGleb Smirnoff icmp6_ratelimit(const struct in6_addr *dst, const int type, const int code) 286782cd038dSYoshinobu Inoue { 2868a03aff88SGleb Smirnoff ratelim_which which; 2869a03aff88SGleb Smirnoff int64_t pps; 287082cd038dSYoshinobu Inoue 2871a03aff88SGleb Smirnoff if (V_icmp6errppslim == 0) 2872a03aff88SGleb Smirnoff return (0); 287382cd038dSYoshinobu Inoue 2874a03aff88SGleb Smirnoff switch (type) { 2875a03aff88SGleb Smirnoff case ICMP6_PARAM_PROB: 2876a03aff88SGleb Smirnoff which = RATELIM_PARAM_PROB; 2877a03aff88SGleb Smirnoff break; 2878a03aff88SGleb Smirnoff case ICMP6_PACKET_TOO_BIG: 2879a03aff88SGleb Smirnoff which = RATELIM_TOO_BIG; 2880a03aff88SGleb Smirnoff break; 2881a03aff88SGleb Smirnoff case ICMP6_DST_UNREACH: 2882a03aff88SGleb Smirnoff which = RATELIM_UNREACH; 2883a03aff88SGleb Smirnoff break; 2884a03aff88SGleb Smirnoff case ICMP6_TIME_EXCEEDED: 2885a03aff88SGleb Smirnoff which = RATELIM_TEXCEED; 2886a03aff88SGleb Smirnoff break; 2887a03aff88SGleb Smirnoff case ND_REDIRECT: 2888a03aff88SGleb Smirnoff which = RATELIM_REDIR; 2889a03aff88SGleb Smirnoff break; 2890a03aff88SGleb Smirnoff case ICMP6_ECHO_REPLY: 2891a03aff88SGleb Smirnoff which = RATELIM_REPLY; 2892a03aff88SGleb Smirnoff break; 2893a03aff88SGleb Smirnoff default: 2894a03aff88SGleb Smirnoff which = RATELIM_OTHER; 2895a03aff88SGleb Smirnoff break; 2896a03aff88SGleb Smirnoff }; 2897a03aff88SGleb Smirnoff 2898a03aff88SGleb Smirnoff pps = counter_ratecheck(&V_icmp6_rates[which], V_icmp6errppslim + 2899a03aff88SGleb Smirnoff V_icmp6lim_curr_jitter); 2900a03aff88SGleb Smirnoff if (pps > 0) { 2901a03aff88SGleb Smirnoff if (V_icmp6lim_output) 2902a03aff88SGleb Smirnoff log(LOG_NOTICE, "Limiting ICMPv6 %s output from %jd " 2903a03aff88SGleb Smirnoff "to %d packets/sec\n", icmp6_rate_descrs[which], 2904a03aff88SGleb Smirnoff (intmax_t )pps, V_icmp6errppslim + 2905a03aff88SGleb Smirnoff V_icmp6lim_curr_jitter); 2906a03aff88SGleb Smirnoff icmp6lim_new_jitter(); 2907a03aff88SGleb Smirnoff } 2908a03aff88SGleb Smirnoff if (pps == -1) { 2909c6c96aabSGleb Smirnoff ICMP6STAT_INC(icp6s_toofreq); 2910a03aff88SGleb Smirnoff return (-1); 291182cd038dSYoshinobu Inoue } 291282cd038dSYoshinobu Inoue 2913a03aff88SGleb Smirnoff return (0); 291482cd038dSYoshinobu Inoue } 2915